Quantum LTO 4 User manual

Copyright © 2008 Quantum. All rights reserved
Document Number: 200201090-001 Revision B
Quantum and the Quantum logo are trademarks of Quantum. Other product names are trademarks or registered
trademarks of their owners.
Linear Tape-Open, LTO, the LTO logo, Ultrium, and the Ultrium logo are trademarks of Certance (now owned by
Quantum), HP and IBM in the US and other countries or both.
Quantum reserves the right to change, without notice, product offerings or specifications. No part of this publication
may be reproduced in any form without written permission from Quantum.
Quantum provides this manual “as is,” without warranty of any kind, either expressed or implied, including, but not
limited to, the implied warranties of merchantability and fitness for a particular purpose. Quantum reserves the right to
change, without notification, the specifications contained in this manual.
Quantum assumes no responsibility for the accuracy, completeness, sufficiency, or usefulness of this manual, nor for
any problem that might arise from the use of the information in this manual

Important Information About This Manual
All information contained in or disclosed by this document is proprietary to Quantum.
By accepting this material, the recipient agrees that this material and the information
contained therein are held in confidence and in trust and will not be used,
reproduced in whole or in part, nor its contents revealed to others, except to meet
the purpose for which it was delivered. It is understood that no right is conveyed to
reproduce or translate any item herein disclosed without express written permission
from Quantum.
Quantum provides this manual "as is," without warranty of any kind, either
expressed or implied, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Quantum reserves the right to
change, without notification, the specifications contained in this manual.
Quantum assumes no responsibility for the accuracy, completeness, sufficiency, or
usefulness of this manual, nor for any problem that might arise from the use of the
information in this manual.

Contents Page iii
Contents
Important Information About This Manual...........................................................................................................................ii
Contents................................................................................................................................................................................iii
1Introduction ................................................................................................................................................................... 1
1.1 About This Manual................................................................................................................................................ 1
1.2 Differences in Various Model Behavior................................................................................................................ 1
2Interface Overview ........................................................................................................................................................ 3
2.1 General................................................................................................................................................................... 3
2.1.1 Interface and Command Standards................................................................................................................ 3
2.1.2 Cabling and Connectors................................................................................................................................. 3
2.1.3 General features............................................................................................................................................. 3
2.2 Serial Attached SCSI Interface (SAS)................................................................................................................... 3
2.2.1 SAS General features..................................................................................................................................... 3
2.2.2 SAS protocol.................................................................................................................................................. 4
2.2.3 SAS transmission error detection/recovery.................................................................................................... 4
2.3 SCSI Parallel Interface (SPI)................................................................................................................................. 4
2.3.1 SPI General features ...................................................................................................................................... 4
2.3.2 Disconnect/Reconnect Function .................................................................................................................... 4
2.3.3 SCSI Messages .............................................................................................................................................. 5
2.3.4 Inbound messages.......................................................................................................................................... 5
2.3.5 Outbound messages ....................................................................................................................................... 6
2.3.6 Extended messages........................................................................................................................................ 7
2.3.7 Parallel Protocol Feature Support.................................................................................................................. 7
2.3.8 Parity errors ................................................................................................................................................... 7
2.3.9 Message exception handling.......................................................................................................................... 9
2.4 Fibre Channel Interface Overview....................................................................................................................... 12
2.4.1 FCP General features................................................................................................................................... 12
2.4.2 Link Services............................................................................................................................................... 12
2.4.3 Name Server Requests................................................................................................................................. 13
2.4.4 Task Management Requests ........................................................................................................................ 13
2.4.5 FCP Information Units................................................................................................................................. 13
2.5 Standards Conformance....................................................................................................................................... 14
2.5.1 INCITS Technical Committee T10 (SCSI Storage Interfaces) Standards................................................... 14
2.5.2 INCITS Technical Committee T11 (Device Level Interfaces) Standards.................................................... 15
2.6 LTO Conformance............................................................................................................................................... 15
2.7 General Behaviors ............................................................................................................................................... 16
2.7.1 Reset Condition ........................................................................................................................................... 16
2.7.2 Unit Attention Condition............................................................................................................................. 16
2.7.3 Contingent Allegiance Condition (SCSI Parallel Interface only) ................................................................ 16
2.7.4 Buffered Mode............................................................................................................................................. 17
2.7.5 Immediate Commands................................................................................................................................. 17
2.7.6 Residual Length Function............................................................................................................................ 17
2.7.7 Early Warning Function............................................................................................................................... 17
2.7.8 Error Reporting............................................................................................................................................ 18
2.7.9 Variable and Fixed Mode Recording........................................................................................................... 18
2.7.10 Library Features........................................................................................................................................... 19
3SCSI Commands.......................................................................................................................................................... 22
3.1 SCSI Command Set............................................................................................................................................. 22

Contents Page iv
3.1.1 SCSI Command Conventions...................................................................................................................... 23
3.2 SCSI Command Descriptor Blocks ..................................................................................................................... 23
3.2.1 SCSI Command Descriptor Block Formats................................................................................................. 23
3.2.2 SCSI Command Operation Code Format..................................................................................................... 25
3.2.3 SCSI Command Control Byte Format......................................................................................................... 25
3.3 SCSI Command Status ........................................................................................................................................ 26
3.3.1 SCSI Status Byte Format............................................................................................................................. 26
3.3.2 SCSI Status Codes....................................................................................................................................... 26
3.4 ERASE ................................................................................................................................................................ 27
3.4.1 ERASE Command Descriptor Block........................................................................................................... 27
3.4.2 ERASE Completion Status.......................................................................................................................... 28
3.5 INQUIRY ............................................................................................................................................................ 29
3.5.1 INQUIRY Command Descriptor Block....................................................................................................... 29
3.5.2 Standard INQUIRY Data Page.................................................................................................................... 30
3.5.3 Supported Vital Product Data (VPD) Page (00h)........................................................................................ 32
3.5.4 Unit Serial Number Page (80h).................................................................................................................... 33
3.5.5 Device Identification Page (83h) ................................................................................................................. 34
3.5.6 Sequential Access Device Capabilities Page (B0h)..................................................................................... 35
3.5.7 Drive Component Revision Levels Pages (C0h, C1h)................................................................................. 36
3.5.8 Drive Component Serial Number Page (C2, C3, C4, C5, C6h)................................................................... 37
3.5.9 Command Support Data Format.................................................................................................................. 37
3.5.10 INQUIRY Completion Status...................................................................................................................... 38
3.6 LOAD UNLOAD ................................................................................................................................................ 39
3.6.1 LOAD UNLOAD Command Descriptor Block........................................................................................... 39
3.6.2 LOAD UNLOAD Completion Status.......................................................................................................... 41
3.7 LOCATE ............................................................................................................................................................. 42
3.7.1 LOCATE Command Descriptor Block........................................................................................................ 42
3.7.2 LOCATE Completion Status....................................................................................................................... 43
3.8 LOG SELECT ..................................................................................................................................................... 44
3.8.1 LOG SELECT Command Descriptor Block................................................................................................ 44
3.8.2 Log Pages .................................................................................................................................................... 45
3.8.3 LOG SELECT Completion Status............................................................................................................... 47
3.9 LOG SENSE........................................................................................................................................................ 48
3.9.1 LOG SENSE Command Descriptor Block.................................................................................................. 48
3.9.2 Log Sense Parameter Pointer Field.............................................................................................................. 49
3.9.3 Log Pages .................................................................................................................................................... 50
3.9.4 Supported Log Pages Log Page (00h).......................................................................................................... 52
3.9.5 Write Error Counters Log Page (02h).......................................................................................................... 54
3.9.6 Read Error Counters Log Page (03h)........................................................................................................... 55
3.9.7 Sequential Access Device Log Page (0Ch).................................................................................................. 55
3.9.8 Temperature Log Page (0Dh) ...................................................................................................................... 56
3.9.9 TapeAlert Response Log Page (12h)........................................................................................................... 57
3.9.10 Device Statistics Log Page (14h)................................................................................................................. 58
3.9.11 Tape Diagnostic Data Log Page (16h)......................................................................................................... 60
3.9.12 Protocol Specific Port Log Page (18h) - SAS Drives Only ........................................................................63
3.9.13 TapeAlert Log Page (2Eh)........................................................................................................................... 66
3.9.14 Tape Usage Log Page (30h)......................................................................................................................... 72
3.9.15 Tape Capacity Log Page (31h) .................................................................................................................... 73
3.9.16 Data Compression Log Page (32h).............................................................................................................. 74
3.9.17 Error Events Log Page (33h) ....................................................................................................................... 74
3.9.20 Tape Device Statistics Log Page (3Eh)........................................................................................................ 77
3.9.21 LOG SENSE Completion Status ................................................................................................................. 77
3.10 MODE SELECT.................................................................................................................................................. 78
3.10.1 MODE SELECT Command Descriptor Block............................................................................................78
3.10.2 MODE SELECT Parameters ....................................................................................................................... 80

Contents Page v
3.10.3 Mode Parameter Header .............................................................................................................................. 80
3.10.4 MODE SELECT Block Descriptor.............................................................................................................. 81
3.10.5 Mode Parameter Pages................................................................................................................................. 82
3.10.6 Disconnect/Reconnect Mode Page (02h)..................................................................................................... 84
3.10.7 Control Mode Page (0Ah)............................................................................................................................ 88
3.10.8 Data Compression Control Mode Page (0Fh).............................................................................................. 90
3.10.9 Sequential Access Device Configuration Mode Page (10h)........................................................................ 91
3.10.10 Protocol-Specific Logical Unit Mode Page (18h).................................................................................... 93
3.10.11 Protocol-Specific Port Mode Page (19h)................................................................................................. 95
3.10.12 Informational Exceptions Mode Page (1Ch)............................................................................................ 99
3.10.13 Medium Configuration Mode Page (1Dh)............................................................................................. 101
3.10.14 Drive Capabilities Control Mode Page (21h)......................................................................................... 102
3.10.15 Interface Control Mode Page (22h) ....................................................................................................... 104
3.10.16 MODE SELECT Completion Status...................................................................................................... 105
3.11 MODE SENSE .................................................................................................................................................. 106
3.11.1 MODE SENSE Command Descriptor Block.............................................................................................107
3.11.2 MODE SENSE Data.................................................................................................................................. 109
3.11.3 Mode Parameter Header ............................................................................................................................ 109
3.11.4 MODE SENSE Block Descriptor.............................................................................................................. 111
3.11.5 Mode Parameter Pages............................................................................................................................... 111
3.11.6 MODE SENSE Completion Status............................................................................................................ 112
3.12 PARK UNPARK............................................................................................................................................... 113
3.12.1 PARK UNPARK Command Descriptor Block.......................................................................................... 113
3.12.2 PARK UNPARK Completion Status......................................................................................................... 113
3.13 PERSISTENT RESERVE IN............................................................................................................................ 114
3.13.1 PERSISTENT RESERVE IN Command Descriptor Block ...................................................................... 114
3.13.2 PERSISTENT RESERVE IN Completion Status...................................................................................... 116
3.14 PERSISTENT RESERVE OUT........................................................................................................................ 117
3.14.1 Command Descriptor Block ...................................................................................................................... 117
3.14.2 PERSISTENT RESERVE OUT Completion Status.................................................................................. 119
3.15 PREVENT ALLOW MEDIUM REMOVAL....................................................................................................120
3.15.1 PREVENT ALLOW MEDIUM REMOVAL Command Descriptor Block.............................................. 120
3.15.2 PREVENT ALLOW MEDIUM REMOVAL Completion Status ............................................................. 121
3.16 READ................................................................................................................................................................ 122
3.16.1 READ Command Descriptor Block........................................................................................................... 122
3.16.2 READ Command Operation...................................................................................................................... 124
3.16.3 READ Completion Status.......................................................................................................................... 127
3.17 READ ATTRIBUTE......................................................................................................................................... 128
3.17.1 READ ATTRIBUTE Command Descriptor Block.................................................................................... 128
3.17.2 READ ATTRIBUTE Service Action Codes.............................................................................................. 129
3.17.3 ATTRIBUTE VALUES Service Action.................................................................................................... 129
3.17.4 ATTRIBUTE LIST Service Action........................................................................................................... 129
3.17.5 VOLUME LIST Service Action................................................................................................................ 130
3.17.6 PARTITION LIST Service Action............................................................................................................ 130
3.17.7 Medium Auxiliary Memory Attributes...................................................................................................... 131
3.17.8 Attributes Supported by the drive.............................................................................................................. 132
3.17.9 READ ATTRIBUTE Completion Status................................................................................................... 138
3.18 READ BLOCK LIMITS.................................................................................................................................... 139
3.18.1 READ BLOCK LIMITS Command Descriptor Block.............................................................................. 139
3.18.2 READ BLOCK LIMITS Data................................................................................................................... 139
3.18.3 READ BLOCK LIMITS Completion Status.............................................................................................140
3.19 READ BUFFER ................................................................................................................................................ 141
3.19.1 READ BUFFER Command Descriptor Block........................................................................................... 141
3.19.2 READ BUFFER Header............................................................................................................................ 142
3.19.3 READ BUFFER Descriptor....................................................................................................................... 142

Contents Page vi
3.19.4 Echo Buffer Descriptor.............................................................................................................................. 143
3.19.5 Echo Buffer................................................................................................................................................ 143
3.19.6 MAM Page Definitions.............................................................................................................................. 144
3.19.8 READ BUFFER Completion Status.......................................................................................................... 144
3.20 READ POSITION............................................................................................................................................. 145
3.20.1 READ POSITION Command Descriptor Block........................................................................................ 145
3.20.2 READ POSITION Data............................................................................................................................. 146
3.20.3 READ POSITION Completion Status....................................................................................................... 148
3.21 RECEIVE DIAGNOSTIC RESULTS............................................................................................................... 149
3.21.1 RECEIVE DIAGNOSTIC RESULTS Command Descriptor Block......................................................... 149
3.21.2 RECEIVE DIAGNOSTIC RESULTS Returned Data if PCV is not set.................................................... 149
3.21.3 RECEIVE DIAGNOSTIC RESULTS Returned data if PCV set, Page Code = 00h................................. 150
3.21.4 Returned data if PCV set, Page Code = 81h.............................................................................................. 150
3.21.5 RECEIVE DIAGNOSTIC RESULTS Completion Status......................................................................... 151
3.22 RELEASE.......................................................................................................................................................... 152
3.22.1 RELEASE Command Descriptor Blocks .................................................................................................. 152
3.22.2 RELEASE Completion Status ................................................................................................................... 153
3.23 REPORT DENSITY SUPPORT ....................................................................................................................... 154
3.23.1 REPORT DENSITY SUPPORT Command Descriptor Block.................................................................. 154
3.23.2 REPORT DENSITY SUPPORT Data....................................................................................................... 154
3.23.3 REPORT DENSITY SUPPORT Completion Status................................................................................. 157
3.24 REPORT DEVICE IDENTIFIER ..................................................................................................................... 158
3.24.1 REPORT DEVICE IDENTIFIER Command Descriptor Block................................................................ 158
3.24.2 REPORT DEVICE IDENTIFIER Data..................................................................................................... 158
3.24.3 REPORT DEVICE IDENTIFIER Completion Status............................................................................... 159
3.25 REPORT LUNS ................................................................................................................................................ 160
3.25.1 REPORT LUNS Command Descriptor Block........................................................................................... 160
3.25.2 REPORT LUNS Data................................................................................................................................ 160
3.25.3 REPORT LUNS Completion Status.......................................................................................................... 161
3.26 REPORT SUPPORTED OPERATION CODES............................................................................................... 162
3.26.1 REPORT SUPPORTED OPERATION CODES Command Descriptor Block......................................... 162
3.26.2 REPORT SUPPORTED OPERATION CODES Data .............................................................................. 163
3.26.3 REPORT SUPPORTED OPERATION CODES Completion Status ........................................................ 165
3.27 REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS.................................................................... 166
3.27.1 REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS Command Descriptor Block .............. 166
3.27.2 REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS Data ................................................... 166
3.27.3 REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS Completion Status.............................. 167
3.28 REQUEST SENSE............................................................................................................................................ 168
3.28.1 Sense Data Management............................................................................................................................ 168
3.28.2 REQUEST SENSE Command Descriptor Block ...................................................................................... 169
3.28.3 Sense Data Format..................................................................................................................................... 169
3.28.4 REQUEST SENSE Completion Status...................................................................................................... 179
3.29 RESERVE ......................................................................................................................................................... 180
3.29.1 RESERVE Command Descriptor Block.................................................................................................... 180
3.29.2 RESERVE Completion Status................................................................................................................... 181
3.30 REWIND........................................................................................................................................................... 182
3.30.1 REWIND Command Descriptor Block...................................................................................................... 182
3.30.2 REWIND Completion Status..................................................................................................................... 182
3.31 SECURITY PROTOCOL IN............................................................................................................................. 184
3.31.1 SECURITY PROTOCOL IN Command Descriptor Block....................................................................... 184
3.31.2 Supported Security Protocol list ................................................................................................................ 185
3.31.3 Certificate Data.......................................................................................................................................... 185
3.31.4 Tape Data Encryption In Support page...................................................................................................... 185
3.31.5 Tape Data Encryption Out Support page................................................................................................... 186
3.31.6 Data Encryption Capabilities page............................................................................................................. 186

Contents Page vii
3.31.7 Supported Key Formats page..................................................................................................................... 188
3.31.8 Data Encryption Management Capabilities page....................................................................................... 188
3.31.9 Data Encryption Status page...................................................................................................................... 189
3.31.10 Next Block Encryption Status page....................................................................................................... 191
3.31.11 Random Number page........................................................................................................................... 193
3.31.13 Device Server Key Wrapping Public Key page..................................................................................... 193
3.31.15 SECURITY PROTOCOL IN Completion Status.................................................................................. 194
3.32 SECURITY PROTOCOL OUT......................................................................................................................... 195
3.32.1 SECURITY PROTOCOL OUT Command Descriptor Block................................................................... 195
3.32.2 Set Data Encryption page .......................................................................................................................... 196
3.32.3 Tape Data Encryption Descriptors............................................................................................................. 200
3.32.4 SECURITY PROTOCOL OUT Completion Status .................................................................................. 202
3.33 SEND DIAGNOSTIC ....................................................................................................................................... 204
3.33.1 SEND DIAGNOSTIC Command Descriptor Block.................................................................................. 204
3.33.2 SEND DIAGNOSTIC Completion Status................................................................................................. 206
3.34 SET CAPACITY............................................................................................................................................... 207
3.34.1 SET CAPACITY Command Descriptor Block.......................................................................................... 207
3.34.2 SET CAPACITY Completion Status......................................................................................................... 208
3.35 SET DEVICE IDENTIFIER.............................................................................................................................. 209
3.35.1 SET DEVICE IDENTIFIER Command Descriptor Block........................................................................ 209
3.35.2 SET DEVICE IDENTIFIER Data............................................................................................................. 209
3.35.3 SET DEVICE IDENTIFIER Completion Status ....................................................................................... 210
3.36 SPACE............................................................................................................................................................... 211
3.36.1 SPACE Command Descriptor Block......................................................................................................... 211
3.36.2 Space-by-Count Functions......................................................................................................................... 212
3.36.3 Space to EOD ............................................................................................................................................ 213
3.36.4 SPACE Completion Status ........................................................................................................................ 213
3.37 TEST UNIT READY ........................................................................................................................................ 214
3.37.1 TEST UNIT READY Command Descriptor Block................................................................................... 214
3.37.2 TEST UNIT READY Completion Status.................................................................................................. 214
3.38 VERIFY............................................................................................................................................................. 215
3.38.1 VERIFY Command Descriptor Block....................................................................................................... 215
3.38.2 VERIFY Command Operation .................................................................................................................. 216
3.38.3 VERIFY Completion Status ...................................................................................................................... 216
3.39 WRITE .............................................................................................................................................................. 217
3.39.1 WRITE Command Descriptor Block......................................................................................................... 217
3.39.2 WRITE Completion Status........................................................................................................................ 218
3.40 WRITE ATTRIBUTE ....................................................................................................................................... 219
3.40.1 WRITE ATTRIBUTE Command Descriptor Block.................................................................................. 219
3.40.2 WRITE ATTRIBUTE Parameter List Format...........................................................................................220
3.40.3 WRITE ATTRIBUTE Completion Status................................................................................................. 220
3.41 WRITE BUFFER............................................................................................................................................... 221
3.41.1 WRITE BUFFER Command Descriptor Block......................................................................................... 221
3.41.2 Echo Buffer................................................................................................................................................ 223
3.41.3 WRITE BUFFER Data Header.................................................................................................................. 223
3.41.4 WRITE BUFFER Completion Status........................................................................................................ 223
3.42 WRITE FILEMARKS....................................................................................................................................... 224
3.42.1 WRITE FILEMARKS Command Descriptor Block................................................................................. 224
3.42.2 WRITE FILEMARKS Completion Status................................................................................................. 225
4Appendix A: Message Codes..................................................................................................................................... 226

Introduction Page 1
1INTRODUCTION
The Quantum LTO drives are designed for computer environments requiring high
performance, ultra-high capacity data storage. The drives are available in 5.25-inch
internal configurations or as an external subsystem.
Quantum LTO drives incorporate an embedded controller for either the SCSI
Parallel Interface (SPI), the Serial Attached SCSI (SAS) interface, or the Fibre
Channel Protocol for SCSI (FCP) interface. The parallel SCSI drives provide
synchronous or asynchronous SCSI with high speed burst transfers of up to 160
megabytes/second. The SAS interface provides burst data transfer rates of 300
megabytes/second. Drives with Fibre Channel connections provide a burst transfer
rate of up to 425 megabytes/second. The internal drives are tailored for easy
installation in today's computers and the full-featured embedded controller facilitates
easy integration into a variety of systems.
1.1 About This Manual
The information in this manual applies to drives using LTO3 and LTO4 technology.
For drive-specific installation and operational information, including connector
information, refer to the Installation Guide or Product Description Manual for the
specific model of your drive.
1.2 Differences in Various Model Behavior
This manual applies to the following models.
•LTO3 Half High with SCSI Parallel Interface, SAS, & Fibre Channel
Interface
•LTO4 Half High with SAS Interface
Each model has some unique characteristics. Within this manual they are often
noted as to what interface they apply to. The following is a brief list of some of the
differences that will be found.
Inquiry Pages:
Standard Inquiry page has differences due to interface reporting and Model
and Product type
Log Pages:
Added support for Log Page 12h – LTO 4 only
Log Page 18h – SAS interface only
Log Page 19h – SAS interface only

Introduction Page 2
Added an additional TapeAlert in Log Page 0x2E for LTO-4 Tape Alert 0x07
Media Life
Report Density Support data:
LTO3 will report formats of LTO1, LTO2 & LTO3
LTO4 will report formats of LTO2, LTO3 & LTO4
Security Protocol In command only supported by LTO4.
Security Protocol Out command only supported by LTO4.

SCSI Interface Overview Page 3
2INTERFACE OVERVIEW
This chapter discusses interface elements as they pertain to drive functions. Three
interfaces are offered. Depending upon the model selected the Quantum LTO drives
interface to either the Small Computer System Interface (SCSI) bus, or the Serial
Attached SSCI (SAS) bus, or the Fibre Channel bus.
2.1 General
2.1.1 Interface and Command Standards
In addition to the information presented in this manual the applicable standards
should be reviewed before writing host software drivers. In addition, review the
conformance statements, which are given in the Product Description Manual for
each model.
The drives comply with the appropriate interface level standards. The SAS interface
drives conform to Serial Attached SCSI interface standards. The SCSI interface
drives conform to SCSI interface standards, and the Fibre Channel drive conforms
to Fibre Channel interface standards. In addition to the applicable interface
standards the drives comply with SCSI-3 command standards. In a few cases,
vendor unique features are available. These features are compatible with the SCSI
standards.
2.1.2 Cabling and Connectors
The cabling requirements and interface connector pin assignments of the internal
drive models are given in the respective installation guide for each model of LTO
drive.
2.1.3 General features
The LTO drive supports the following:
Multiple Initiator support
Fixed and variable block transfer lengths
Space blocks, filemarks, and EOD
LOG SENSE and LOG SELECT for managing soft error reporting
Multiple LUN support for command forwarding (ADI bridging) of LUN 1 commands to
libraries
2.2 Serial Attached SCSI Interface (SAS)
2.2.1 SAS General features
The LTO SAS interface supports the following:
Serial interface

SCSI Interface Overview Page 4
Data transfers at 300 megabytes per second
SAS differential signaling provides high noise immunity
One SAS port using single bidirectional phy
Full duplex operation
SAS target phy
Transport layer error handling
2.2.2 SAS protocol
Serial Attached SCSI communicates using frames. Five frame types are used:
•Command frame
•Task frame
•XFER_RDY frame
•Data frame
•Response frame
2.2.3 SAS transmission error detection/recovery
Transmission errors detected by CRC-32
2.3 SCSI Parallel Interface (SPI)
2.3.1 SPI General features
The SCSI interface LTO drive supports the following:
Integrated Single-Ended & Low Voltage Differential SCSI transceivers
ST data transfers with parity protection running a max rate of 80Mbytes/sec
DT data transfers with CRC protection running a max rate of 160Mbytes/sec
16 bit SCSI arbitration.
Disconnect/reconnect
Hard reset
2.3.2 Disconnect/Reconnect Function
When the drive is performing a task not requiring communication with the Initiator or
when the tape drive determines that a relatively long time will pass with no bus
activity, it disconnects from the SCSI bus. Examples are:
When rewinding the tape.
When writing to the tape and the buffer is full.
When reading from the tape and the buffer is empty.

SCSI Interface Overview Page 5
When spacing, locating, or generally performing any tape motion when data cannot
be transferred on the SCSI bus.
During the time the Target is disconnected for one of these functions, the bus is free
for use by other devices. The Target initiates both disconnect and reconnect.
If the tape drive is selected while disconnected, it only allows the following actions:
If the command is from a different initiator or is from the same initiator but to a
different LUN, the tape drive accepts the command. If the command is a media-
access command the tape drive disconnects immediately. If the new command is a
REQUEST SENSE, INQUIRY or TEST UNIT READY, then the new command is
executed immediately.
Immediately following selection, the Initiator may send the Identify, No Op, Abort, or
Bus Device Reset messages to the drive.
If the command is from the same initiator to the same LUN, the current command
terminates with a Check Condition and an Abort Sense Key.
2.3.3 SCSI Messages
The SCSI message codes, descriptions, and directions are given in the following
table. Each of these SCSI messages are supported by the Quantum LTO drive.
Code Description Direction
00h Command Complete In
01h Extended Message* In/Out
02h Save Data Pointer In
03h Restore Pointers In
04h Disconnect In
05h Initiator Detected Error Out
06h Abort Out
07h Message Reject In/Out
08h No Operation Out
09h Message Parity Error Out
0Ch Bus Device Reset Out
23h Ignore Wide Residue In
80h+ Identify In/Out
Notes: In = Drive to host; Out = Host to drive
* Only three extended messages are supported: Parallel Protocol Request, Synchronous Data Transfer
Request and Wide Data Transfer Request.
2.3.4 Inbound messages
The following table lists drive to host SCSI messages and their definitions.
Message Hex Code Definition
Command
Complete 00h This message is sent by the drive at the end of the status phase to
indicate that a command is complete. Once the message is sent, the
drive releases the bus and goes to Bus Free
Disconnect 04h
This message is sent by the drive to indicate that it is about to
disconnect from the bus and go to Bus Free. During a Data phase, it
is always preceded by a Save Data Pointers message. If a Message
Reject message is received in response to this message, then the
drive will not disconnect.

SCSI Interface Overview Page 6
Message Hex Code Definition
Extended
Message 01h See page 11 for a description of extended message support
Identify 80h+
An Identify in message is sent to the initiator during reconnect to
indicate which Logical Unit is reconnecting. The Disconnect Privilege
and LUNTAR flags will both be clear
Ignore Wide
Residue 23h This message is sent by the drive to the initiator to indicate that a
byte on a wide bus is not valid. This will be supported whenever a
wide transfer is active.
Message
Reject 07h This message is sent to the initiator when the message received by
the drive is unsupported or inappropriate.
Restore
Pointers 03h This message causes the initiator to reset its data transfer pointers to
the values they held when the last Save Data Pointers message was
sent. It will be sent when a parity error is detected on the bus or
when an Initiator Detected Error message is received in order to retry
the data phase.
Save Data
Pointer 02h This message instructs the initiator to save its current data transfer
pointer for use with a subsequent Restore pointers message. This
message will always be sent before a Disconnect message during
data phases.
2.3.5 Outbound messages
The following table lists host to drive SCSI messages and their definitions.
Message Hex Code Definition
Abort 06h
An abort condition is generated. See Message exception handling on
page 9.
Bus Device
Reset 0Ch A reset condition is generated. See Message exception handling on
page 9.
Extended
Message 01h See Extended messages on the following page for a description of
extended message support
Identify 80h+
The Identify Out message is sent by the initiator to identify the Logical
Unit to be accessed and to set Disconnect Privilege. The LUNTAR flag
must be zero.
The Identify Out message must be sent as the first thing after
selection. If it is sent at any other time, the drive will respond with a
message reject message and go to Bus Free.
Initiator
Detected
Error
05h The initiator has detected an error in the data being sent in a Message
Command, Data or Status phase. The drive will retry the data burst or
message.
If the message is received immediately after an Identify message or
after the Command Complete message has been sent, the drive will go
Bus Free.
Message
Parity Error 09h The initiator has detected a parity error in a message. The drive will retry the message.
If the message is received during a Command, Data or Status phase,
immediately after an Identify message or after the Command Complete
message has been sent, the drive will go Bus Free.
Message
Reject 07h This message is sent when the initiator does not support a message
sent by the drive or considers the message inappropriate. If the
message being rejected is Disconnect, Synchronous Data Transfer
Request or Wide Data Transfer Request, the operation continues
without those features. For all other messages except Restore
Pointers, the message is treated as an Abort message.
If the message is received during a Command, Data or Status phase,
immediately after an Identify message or after the command complete
message has been sent, the drive will go Bus Free.

SCSI Interface Overview Page 7
Message Hex Code Definition
No
Operation 08h This message has no effect and is ignored.
2.3.6 Extended messages
The following table lists extended SCSI messages and their definitions.
Hex Code Message Definition
Synchronous
Data Transfer
Request
01h This message negotiates an agreement between the initiator and
the drive on which is the best data period and offset.
If the message is received after selection and before command
phase, it will then go to Message In phase and respond with a valid
response to complete the negotiation.
If the message is received at any other time, a Message Reject is
sent in response.
Wide Data
Transfer
Request
03h This message negotiates an agreement between the initiator and
the drive on which is the best data width – 8-bit narrow or 16-bit
wide.
If the message is received after selection and before Command
phase, it will then go to Message In phase and respond with a valid
response to complete the negotiation.
If the message is received at any other time, a Message Reject is
sent in response.
Parallel
Protocol
Request
04h This message negotiates an agreement between the initiator and
the drive on which is the best data transfer period, offset, width and
type. This is the message to request DT (Ultra160) synchronous
transfers.
The drive will never initiate a Parallel Protocol Request, but will
expect the initiator to do so.
If the message is received after selection and before Command
phase, it will then go to Message In phase and respond with a valid
response to complete the negotiation.
If the message is received at any other time, a Message Reject is
sent in response.
2.3.7 Parallel Protocol Feature Support
The following table describes the Ultra-160 Parallel Protocol features supported.
Ultra 160 Feature Description and support
FRC_SM Free running clock, precompensation, deskewing and P1 phase pacing
are not supported
QAS_REQ Quick arbitration and selection is not supported
DT_REQ Double transition transfers are supported
IU_REQ Information units are not supported
2.3.8 Parity errors
The following table describes the operation for each of the possible cases of parity
error.
State or Phase Description
Bus Free State The drive does not detect nor react to parity errors on the SCSI bus while
the drive is in a bus free state.

SCSI Interface Overview Page 8
State or Phase Description
Arbitration Phase The drive does not detect nor react to parity errors on the SCSI bus while
arbitration is being performed.
Selection Phase The drive does not detect nor react to parity errors on the SCSI bus while
the drive is being selected.
Selection, Message Out
Phase (Identify Message) If the drive detects a parity error while the host is sending an Identify message, the drive retries forever.
Reselection, Message In
Phase (Identify Message) If the drive is attempting to reconnect to the host and the host asserts ATN because it detected an error, the drive:
Switches the host to the Message Out Phase.
Waits for the host to send a 09 (Parity Error Message)
The drive then performs the retry option by:
Switching the host to the Message In Phase.
Resending the Identify Message
Command Phase If the drive detects a parity error while the host is transferring a CDB, the
drive:
Switches the host to Message In phase
Sends Restore Data Pointers (03h) message
Switches the host to Command phase to retry the command.
If a parity error occurs on the retry the host:
Terminates the transfer.
Switches the host to the Status Phase and sends a Check Condition.
Switches the host to the Message In Phase and sends a Command
Complete.
Sets the Sense Key = B and ASC/ASCQ = 47-00 (SPI interface only).
Data In Phase If the host detects a parity error while data is being transferred from the
drive and asserts ATN, the drive:
Terminates the transfer of data.
Switches the host to the Message Out Phase.
Waits for the host to send a 05 (Host Detected Error).
Switches the host to the Status Phase and sends a Check Condition.
Switches the host to the Message In Phase and sends a Command
Complete.
Sets the Sense Key = B and ASC/ASCQ = 48-00 (SPI interface only).
Data Out Phase If the drive detects a parity error while the host is transferring data, the
drive:
Terminates the transfer of data.
Switches the host to the Status Phase and sends a Check Condition.
Switches the host to the Message In Phase and sends Command
Complete.
Sets the Sense Key = B and ASC/ASCQ = 47-00 (SPI interface only).
Status Phase If the host is in the Status phase and detects an error in the status byte
and asserts ATN, the drive:
Switches the host to the Message Out Phase and waits for the host to
send 05 (Initiator Detected Error).
Switches the host to the Status Phase and sends a Check Condition.
Target sends restore pointers and resends Status.
Message In Phase If the host is in the Message In Phase and detects an error on a message
bytes an asserts ATN, the drive:
Switches the host to the Message Out Phase.
Waits for the host to send 09 (Parity Error Message).
Switches the host to the Message In Phase and resends the message.
Message Out Phase If the host is in the Message Out Phase and sends a message bytes and
the drive detects a parity error, the drive retries forever.

SCSI Interface Overview Page 9
An Initiator that accommodates disconnect/reconnect can indicate this capability to
the tape drive during the Selection phase by asserting both its own Initiator SCSI ID
bit as well as the tape drive’s SCSI ID bit (allows the tape drive to know with which
Initiator to reconnect). The Initiator must also assert ATN before exiting the Selection
phase (prior to releasing SEL) and send an Identify message out of C0h to the tape
drive. This sequence causes the drive to enter the Message-Out phase when the
Selection phase completes.
The first message sent by the host after the Selection phase is an Identify message.
Under normal conditions, the first message sent by the tape drive after a
Reselection phase is also Identify. Under certain exceptional conditions, the host
may send the Abort message or the Bus Device Reset message instead of Identify
as the first message.
2.3.9 Message exception handling
Message exceptions are handled as described in the following tables. The numbers
in the tables identify the actions that the drive takes when an exception under the
identified conditions occurs. The actions are described following the tables.
IN Phase during which ATN is raised
Message Selection Identify Command Data in Data out Status Negotiate
Abort (06h) 2 2 2 2 2 2 2
BDR (0Ch) 11 11 11 11 11 11 11
Identify
(80h/C0h) 12 7 7 7 7 7 7
IDE (05h) 5 2 If Retry, 8,
else 5 If Retry, 8, else 5 If Retry, 8, else 5 If Retry, 8, if
Status, 2, if
No Status,
5
If Retry, 4,
else 5
Reject (07h) 5 2 2 2 2 2 1
Parity (09h) 5 2 11 11 11 11
If Retry, 4,
else 5
NOP (08h) 5 9 9 9 9 9
If EOM, 9,
else 4
Negotiate 5 10 7 7 7 7 10
Unrecognized
or illegal 5 6 6 6 6 6
If EOM, 6,
else 4
IN Phase during which ATN is raised
Message
Save Data
Pointers
(02h)
Restore
Pointers
(03h)
Disconnect
(04h)
Reject
Message
(07h)
Identify
(80h)
Command
Complete
(00h)
Ignore
Wide
Residue
(23h)
Abort (06h) 2 2 2 2 2 2 2
BDR (0Ch) 11 11 11 11 11 11 11
Identify
(80h/C0h) 7 7 7 7 7 2 7
IDE (05h) If Retry, 4
else 5 If Status, 2,
if No Status,
5
If Retry, 4,
else 5 If Retry, 4, else 13 If retry, 4, else 5 2 If retry, 4,
else 5
Reject (07h) 2 If Status, 2,
if No Status,
5
1 2 2 2 2
Parity (09h) If Retry, 4 If Status, 2, If Retry, 4, If Retry, 4, If Retry, 4, 2 If Retry, 4,

SCSI Interface Overview Page 10
IN Phase during which ATN is raised
Message
Save Data
Pointers
(02h)
Restore
Pointers
(03h)
Disconnect
(04h)
Reject
Message
(07h)
Identify
(80h)
Command
Complete
(00h)
Ignore
Wide
Residue
(23h)
else 5 if No Status,
5 else 5 else 13 else 5 else 5
NOP (08h) 9 9 9 9 9 2
If EOM, 9,
else 4
Negotiate 7 7 7 7 7 2 7
Unrecognized
or illegal 6 6 6 6 6 2
If EOM, 6,
else 4
Retry Retry has not been exhausted
EOM End of the message
Negotiate PPR, SDTR or WDTR message negotiation
Status Status has been reported
No Status Status has not been reported

SCSI Interface Overview Page 11
2.3.9.1 Action codes in Message exception handling tables
1. Disconnect message case - the drive will not disconnect for the rest of the
command.
PPR message case - both the initiator and the drive go to asynchronous mode
and 8-bit narrow.
SDTR message case - both the initiator and the drive go to asynchronous mode.
WDTR message case - both the initiator and the drive go to asynchronous mode
and 8-bit narrow.
Default case - The Message Out Reject disables the feature and continues.
2. The drive goes Bus Free without setting up sense data.
3. RESERVED
4. The drive resends the message.
5. The drive issues Check Condition status and sets up sense data indicating an
Aborted command.
6. The drive rejects the message by issuing Message Reject message and
continues its operation.
7. The drive rejects the message by issuing Message Reject message. The drive
goes Bus Free without setting up sense data.
8. The drive issues Restore Pointers message and retries unless retry count
exhausted.
9. The drive ignores the message and continues.
10. Negotiations per SPI-3 spec.
11. The drive goes Bus Free and sets up sense data.
12. The drive accepts the Identify message, observes the disconnect-privilege bit in
the Identify message and then continues.
13. If the drive is continuing an operation after sending a Message in Reject, then
the drive issues Check Condition status and sets up sense data indicating an
Aborted command (Action 5), if not, then the drive goes Bus Free without setting
up sense data (Action 2).

SCSI Interface Overview Page 12
2.4 Fibre Channel Interface Overview
The drive’s Fibre Channel Protocol, (FCP), interface consists of two independent
NL_Ports, each of which is a bi-directional 1.0625, 2.125, or 4.250 GHz serial
connection. The ports perform automatic speed negotiation to operate at the higher
speed common to all connected ports. By connecting devices to a hub, a loop of up
to 126 devices can be constructed. Up to 16 million devices can be connected via a
switch. Each port has an LC style optical connector and can be connected to a
separate host, arbitrated loop, or fabric.
The LTO-3 Fibre Channel drives have an internal FC controller integrated into the
drive electronics.
2.4.1 FCP General features
The LTO Fibre Channel drive supports the following:
Connection in point-to-point, arbitrated loop, and fabric topologies as an Nx_Port
Command queuing
Both single and multi-initiator systems
A 1/2/4 Gbit/second autonegotiating port
SCSI-3 task management requests
Reset via selective and broadcast Reset LIP, in addition to the Target and Logical
Unit Reset requests
Auto Contingent Allegiance. For details, see the SCSI Architectural Model–2 (SAM-
2) standard.
2.4.2 Link Services
The following basic link services, extended link services, and -4 link services are
supported by The LTO Fibre Channel drive:
Abort Sequence (ABTS)
Accept (ACC)
Basic Accept (BA_ACC)
Basic Reject (BA_RJT)
Discover Address (ADISC)
Discover N_Port Parameters (PDISC) – Obsolete, but supported for legacy
compatibility
Fabric Login (FLOGI)
Fabric Address Notification (FAN)
Logout (LOGO)
Link Service Reject (LS_RJT)
N_Port Login (PLOGI)
Process Login (PRLI)
Process Logout (PRLO)
Read Exchange Concise (REC)