HPE Compaq StorageWorks SSL2000 Series Manual

SSL2000 Series Library
Maintenance and Service Guide
First Edition (May 2000)
Part Number 187195-001
Compaq Computer Corporation

Notice
© 2000 Compaq Computer Corporation.
Compaq, the Compaq logo, and StorageWorks Registered in U. S. Patent and Trademark Office.
All other product names mentioned herein may be trademarks or registered trademarks of their respective
companies.
Confidential computer software. Valid license from Compaq required for possession, use or copying.
Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software
Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under
vendor's standard commercial license.
Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
The information in this publication is subject to change without notice and is provided “AS IS” WITHOUT
WARRANTY OF ANY KIND. THE ENTIRE RISK ARISING OUT OF THE USE OF THIS
INFORMATION REMAINS WITH RECIPIENT. IN NO EVENT SHALL COMPAQ BE LIABLE FOR
ANY DIRECT, CONSEQUENTIAL, INCIDENTAL, SPECIAL, PUNITIVE OR OTHER DAMAGES
WHATSOEVER (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
PROFITS, BUSINESS INTERRUPTION OR LOSS OF BUSINESS INFORMATION), EVEN IF
COMPAQ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING
SHALL APPLY REGARDLESS OF THE NEGLIGENCE OR OTHER FAULT OF EITHER PARTY
AND REGARDLESS OF WHETHER SUCH LIABILITY SOUNDS IN CONTRACT, NEGLIGENCE,
TORT, OR ANY OTHER THEORY OF LEGAL LIABILITY, AND NOTWITHSTANDING ANY
FAILURE OF ESSENTIAL PURPOSE OF ANY LIMITED REMEDY.
The limited warranties for Compaq products are exclusively set forth in the documentation accompanying
such products. Nothing herein should be construed as constituting a further or additional warranty.
Printed in the U.S.A.
Compaq StorageWorks SSL2000 Series Library Maintenance and Service Guide
Maintenance and Service Guide
First Edition (April 2000)
Part Number 187195-001

Contents
About This Guide
Symbols in Text..........................................................................................................xi
Compaq Technician Notes ........................................................................................xii
Where to Go for Additional Help..............................................................................xii
Integrated Management Display........................................................................xiii
Telephone Numbers ..........................................................................................xiii
Chapter 1
System Description
Introduction..............................................................................................................1-1
Library Models.........................................................................................................1-1
Multi-Unit Library Systems .....................................................................................1-2
Tape Cartridge Magazine Mail Slot .........................................................................1-2
SCSI Interface ..........................................................................................................1-2
Multi-Server Data Sharing ................................................................................1-3
SCSI Configuration...........................................................................................1-3
SCSI Bus Performance Considerations....................................................................1-3
Drives................................................................................................................1-3
Data Transfer Rate ............................................................................................1-3
Internal Cabling Configuration..........................................................................1-3
Bus Length Limitations.....................................................................................1-4
Independent SCSI Buses for SE........................................................................1-4
Physical Configuration.............................................................................................1-4
Shuttle Lockdown Mechanism.................................................................................1-4
Library Features .......................................................................................................1-5
Control Panel.....................................................................................................1-6
Display ..............................................................................................................1-6
Power Supply ....................................................................................................1-6
Tape Cartridge Magazine..................................................................................1-7
Integral Fan Cooling..........................................................................................1-8
Robotics.............................................................................................................1-8
Bar Code Reader ...............................................................................................1-8
Advanced Design Features.......................................................................................1-8
Embedded Diagnostics......................................................................................1-8
Error Checking..................................................................................................1-8
Buffer ................................................................................................................1-8
Compression......................................................................................................1-9
Capacity.............................................................................................................1-9
Media Life.........................................................................................................1-9

iv Compaq StorageWorks SSL2000 Series Library Maintenance and Service Guide
Chapter 2
Operation
Introduction..............................................................................................................2-1
Front Panel ...............................................................................................................2-2
Power Switch.....................................................................................................2-2
Indicators and Buttons.......................................................................................2-3
LED Indicators.........................................................................................................2-4
Buttons .....................................................................................................................2-4
Using the Enter Button to Access Main Menu..................................................2-4
Using the Escape Button to Return to Default Screen.......................................2-4
Using the Escape Button to Access Status Mode..............................................2-5
Front Panel and Media Locks...................................................................................2-5
Startup Display Messages.........................................................................................2-6
Power-On Self Test Screen ...............................................................................2-6
Initialization Screens.........................................................................................2-6
Default Screen...................................................................................................2-7
Fault Screen.......................................................................................................2-7
Using the Library Menus..........................................................................................2-8
Using the Status Mode..............................................................................................2-9
Exiting the Status Mode....................................................................................2-9
Exploring the Status Mode................................................................................2-9
Library Status Submenu....................................................................................2-9
Drive Status Menu...........................................................................................2-10
Map Information Screen..................................................................................2-11
Using the Menu Mode............................................................................................2-11
Exiting the Menu Mode...................................................................................2-12
Navigating through the Menu Structure..........................................................2-12
Load/Unload Menu.................................................................................................2-12
Remove Magazine Menu........................................................................................2-12
Maintenance Menu.................................................................................................2-13
Configure Menu .....................................................................................................2-13
Security Menu ........................................................................................................2-13
Displaying Firmware Revisions .............................................................................2-14
Loading and Unloading..........................................................................................2-14
Inserting and Removing Cartridges........................................................................2-16
Removing the Magazine.........................................................................................2-17
Emergency Magazine Removal.......................................................................2-17
Inserting Cartridges into the Magazine ...........................................................2-18
Inserting the Magazine....................................................................................2-18
Using the Mail Slot .........................................................................................2-19
Tape Cartridge Requirements.................................................................................2-19
Write Protecting Cartridges.............................................................................2-20
Bar Code Labels.....................................................................................................2-21
Multi-Unit Library System Operation....................................................................2-22
Powering Up....................................................................................................2-22
Connecting a Multi-Unit Library System........................................................2-22
Chapter 3
Maintenance
Introduction..............................................................................................................3-1
Running a Cleaning Cartridge..................................................................................3-1
Running a Cleaning Cartridge Automatically...................................................3-2
Running a Cleaning Cartridge Manually...........................................................3-2

About This Guide v
Removing the Cleaning Cartridge............................................................................3-3
Exercising the Library Robotics...............................................................................3-3
Chapter 4
Troubleshooting
Introduction..............................................................................................................4-1
Platform Problems....................................................................................................4-1
General Drive Errors ................................................................................................4-1
Error Recovery.........................................................................................................4-2
Error Recovery Procedures.......................................................................................4-3
Fault Symptom Codes (FSCs)..................................................................................4-3
Chapter 5
Parts Removal and Replacement
Introduction..............................................................................................................5-1
FRUs.........................................................................................................................5-1
Precaution.................................................................................................................5-2
Ferrites......................................................................................................................5-2
Using Loctite 222.....................................................................................................5-2
Removing and Replacing the Bar Code Reader.......................................................5-3
Removing and Replacing the Controller Board........................................................5-6
Removing and Replacing the Door Solenoid .........................................................5-10
Removing and Replacing a Tape Drive..................................................................5-11
Removing and Replacing the Fan Assembly..........................................................5-14
Removing and Replacing the Front Panel..............................................................5-15
Removing and Replacing the Magazine Guide......................................................5-16
Removing and Replacing the Magazine Latch Solenoid........................................5-19
Removing and Replacing the Power Supply Assembly .........................................5-20
Removing and Replacing the Power Switch ..........................................................5-27
Removing and Replacing the Shuttle Mechanism..................................................5-28
Removing and Replacing a PTM............................................................................5-35
Appendix A
Specifications
Introduction.............................................................................................................A-1
Safety.......................................................................................................................A-7
Electromagnetic Emission (EM) .............................................................................A-7
Notice...............................................................................................................A-7
Industry Canada................................................................................................A-7
Industrie Canada...............................................................................................A-7
FCC Notice.......................................................................................................A-8
FCC and VCCI Requirements.................................................................................A-9
Statement for Equipment Meeting FCC Class A Requirements.......................A-9
Equipment Meeting VDE Class B Requirements (VFG 1046/84 and VFG
243/91 for Germany)......................................................................................A-10
VCCI Notice for Japan Class I Equipment.....................................................A-11
Appendix B
FRUs, Spares, and Accessories
Introduction.............................................................................................................B-1

vi Compaq StorageWorks SSL2000 Series Library Maintenance and Service Guide
Appendix C
Installation
Introduction.............................................................................................................C-1
Unpacking ...............................................................................................................C-1
Releasing the Lockdown Mechanism......................................................................C-2
Setting up the Desktop Model.................................................................................C-4
Setting up the Rackmount Model............................................................................C-4
Precaution.........................................................................................................C-4
Removing the Desktop Outside Cover.............................................................C-5
Installing the Rackmount Top Cover ...............................................................C-6
Installing the Inner Slide Members ..................................................................C-7
Installing the Panel Extensions.........................................................................C-9
Installing the Rackmount Model into a Storage Cabinet................................C-10
Installing and Removing the PTM.........................................................................C-10
Installing a Pre-Assembled PTM....................................................................C-10
Removing a PTM...........................................................................................C-15
Adding a PTM Extrusion ...............................................................................C-16
Setting up Interfaces and Cables ...........................................................................C-28
Power Cord Connector...................................................................................C-29
SCSI Interface Connectors.............................................................................C-30
Interface Cable Specifications........................................................................C-30
Cabling the PTM and Multi-Unit Library System.................................................C-31
Connecting to the PTM Motor Housing Assembly........................................C-31
Connecting to Library Units...........................................................................C-33
Configuring the Library.........................................................................................C-35
Setting a SCSI ID...........................................................................................C-35
Configuring a Library System...............................................................................C-37
The Master Unit .............................................................................................C-37
The Slave Unit................................................................................................C-38
Setting up Reserved Slots......................................................................................C-39
How Reserved Slots are Numbered................................................................C-39
To Reserve Slots.............................................................................................C-41
Configuration Options...........................................................................................C-41
SCSI Options..................................................................................................C-41
Library Options..............................................................................................C-43
Bar Code Options...........................................................................................C-43
Set Element Base............................................................................................C-44
Set Serial Number ..........................................................................................C-44
Set Default......................................................................................................C-44
Configuration Settings...........................................................................................C-45
Index

About This Guide vii
List of Figures
Figure 1-1. Library front view.................................................................................1-5
Figure 1-2. Library rear view ..................................................................................1-6
Figure 1-3. Tape cartridge magazine.......................................................................1-7
Figure 2-1. Library front panel................................................................................2-2
Figure 2-2. Library control panel ............................................................................2-3
Figure 2-3. Library menus.......................................................................................2-8
Figure 2-4. Magazine in place...............................................................................2-17
Figure 2-5. Tape magazine with cartridges installed.............................................2-18
Figure 2-6. Mail slot location................................................................................2-19
Figure 2-7. Tape cartridge write protection switch................................................2-20
Figure 2-8. Bar code label size..............................................................................2-21
Figure 4-1. Troubleshooting flowchart....................................................................4-2
Figure 5-1. Moving the shuttle assembly ................................................................5-3
Figure 5-2. Disconnecting the bar code reader cable...............................................5-4
Figure 5-3. Removing the bar code reader ..............................................................5-5
Figure 5-4. Jack screw locations..............................................................................5-6
Figure 5-5. Top guide pin and keyhole....................................................................5-7
Figure 5-6. Bottom guide pin and keyhole..............................................................5-8
Figure 5-7. Removing the controller board .............................................................5-8
Figure 5-8. Replacing the controller board..............................................................5-9
Figure 5-9. Removing the door solenoid...............................................................5-10
Figure 5-10. Removing the brace plate..................................................................5-11
Figure 5-11. Removing the upper drive mounting plate........................................5-11
Figure 5-12. Disconnecting the tape drive.............................................................5-12
Figure 5-13. Removing the tape drive...................................................................5-12
Figure 5-14. Removing the alignment pins ...........................................................5-13
Figure 5-15. Replacing the fan assembly ..............................................................5-14
Figure 5-16. Front panel attachment screw locations............................................5-15
Figure 5-17. Disconnecting the front panel cable..................................................5-16
Figure 5-18. Removing the bottom drive mounting plate......................................5-17
Figure 5-19. Magazine guide screw locations.......................................................5-17
Figure 5-20. Removing the magazine guide..........................................................5-18
Figure 5-21. Removing the magazine latch cover.................................................5-19
Figure 5-22. Magazine latch solenoid mounting bracket screw locations.............5-20
Figure 5-23. Disconnecting the picker ribbon cable..............................................5-21
Figure 5-24. Picker ribbon cable tabs....................................................................5-21
Figure 5-25. Turning the base plate.......................................................................5-22
Figure 5-26. Unplugging the power supply...........................................................5-22
Figure 5-27. Power supply retaining screws..........................................................5-23
Figure 5-28. Disconnecting the controller board, fan, and drive power harness ...5-24
Figure 5-29. Disconnecting the power switch wires..............................................5-25
Figure 5-30. Removing the power supply.............................................................5-26
Figure 5-31. Connecting the power cable to the power supply .............................5-26
Figure 5-32. Power switch retaining screws..........................................................5-27
Figure 5-33. Cable clamp tab location...................................................................5-28
Figure 5-34. Cable release lever............................................................................5-29
Figure 5-35. Pushing the shuttle mechanism..........................................................5-30
Figure 5-36. Removing the guide bar screw..........................................................5-31
Figure 5-37. Accessing the guide bar screw..........................................................5-32
Figure 5-38. Lifting the shuttle mechanism...........................................................5-32
Figure 5-39. Anti-rotation bracket location...........................................................5-33
Figure 5-40. Removing the shuttle mechanism.....................................................5-33
Figure 5-41. Unplugging the PTM motor housing assembly control cable...........5-35

viii Compaq StorageWorks SSL2000 Series Library Maintenance and Service Guide
Figure 5-42. Removing the PTM...........................................................................5-36
Figure 5-43. Installing the PTM............................................................................5-37
Figure 5-44. Securing the PTM to the master unit ................................................5-38
Figure C-1. Lockdown mechanism screw..............................................................C-2
Figure C-2. Releasing the lockdown mechanism ...................................................C-3
Figure C-3. Locking the lockdown mechanism......................................................C-4
Figure C-4. Removing the desktop outside cover...................................................C-5
Figure C-5. Installing the rackmount top cover......................................................C-6
Figure C-6. Rackmount slide parts.........................................................................C-7
Figure C-7. Installing the inner slides......................................................................C-8
Figure C-8. Installing the panel extension..............................................................C-9
Figure C-9. Removing the PTM port cover..........................................................C-11
Figure C-10. Installing the PTM...........................................................................C-12
Figure C-11. Securing the PTM to the master unit...............................................C-13
Figure C-12. Securing the PTM to the slave unit.................................................C-14
Figure C-13. Unplugging the PTM motor housing assembly control cable.........C-15
Figure C-14. Location stop pin.............................................................................C-16
Figure C-15. Attaching tie bars ............................................................................C-17
Figure C-16. Attaching PTM extrusions ..............................................................C-17
Figure C-17. Attaching tie bars to the PTM extension.........................................C-18
Figure C-18. Cutting the belt................................................................................C-19
Figure C-19. Threading the belt through the pulleys............................................C-20
Figure C-20. Attaching the belt clamp bracket.....................................................C-21
Figure C-21. Replacing the bottom pulley end cap..............................................C-21
Figure C-22. Snapping the spring over the tension post.......................................C-22
Figure C-23. PTM layout .....................................................................................C-23
Figure C-24. Releasing the elevator car ...............................................................C-23
Figure C-25. Disengaging the wheels...................................................................C-24
Figure C-26. Removing the elevator car...............................................................C-25
Figure C-27. Aligning the belt tensioner ramp.....................................................C-26
Figure C-28. Removing tension from the belt......................................................C-27
Figure C-29. Releasing the bottom pulley assembly............................................C-28
Figure C-30. Removing the bottom pulley assembly...........................................C-28
Figure C-31. Connectors, SCSI terminator, and cables........................................C-29
Figure C-32. Connecting to the PTM motor housing assembly ...........................C-32
Figure C-33. Connecting a patch cable.................................................................C-33
Figure C-34. Connecting to Library units.............................................................C-34
Figure C-35. Reserved slot locations....................................................................C-40

About This Guide ix
List of Tables
Table 1-1 Library Models.........................................................................................1-2
Table 1-2 Tape Capacities........................................................................................1-9
Table 2-1 Control Panel Button Functions...............................................................2-5
Table 4-1 Error Recovery Procedures......................................................................4-3
Table 4-2 Fault Symptom Codes..............................................................................4-3
Table A-1 Operational Performance Specifications................................................A-2
Table A-2 Reliability Specifications (Drives).........................................................A-3
Table A-3 Reliability Specifications (Library System Robotics)............................A-3
Table A-4 Power Specifications..............................................................................A-3
Table A-5 Mechanical Specifications (Tabletop Model).........................................A-4
Table A-6 Mechanical Specifications (Rackmount Model) ....................................A-4
Table A-7 Environmental Specifications (Operating).............................................A-5
Table A-8 Environmental Specifications (Packed or Unpacked)............................A-5
Table A-9 Environmental Specifications (Storage/Transit) ....................................A-6
Table A-10 Acoustic Emission Level......................................................................A-6
Table A-11 Regulator Agency Product Safety Certifications..................................A-7
Table A-12 Acoustic Noise Declaration Declared per ISO 9296 and ISO 7779.....A-8
Table A-13 Schallemissionswerte - Werteangaben nach ISO 9296 und ISO 7779
/DIN EN27779..................................................................................................A-8
Table B-1 FRUs, Spares, and Accessories ..............................................................B-1
Table C-1 Rackmount Slide Parts ...........................................................................C-8
Table C-2 Library Configuration Options.............................................................C-45

About This Guide
This Maintenance and Service Guide is a troubleshooting guide that can be used for reference
when servicing Compaq StorageWorks SSL2000 Series Libraries.
WARNING: To reduce the risk of personal injury from electrical shock and hazardous energy
levels, only authorized service technicians should attempt to repair this equipment. Improper
repairs could create conditions that are hazardous.
IMPORTANT: The installation of options and servicing of this product shall be performed by individuals
who are knowledgeable of the procedures, precautions, and hazards associated with equipment
containing hazardous energycircuits.
Symbols in Text
These symbols may be found in the text of this guide. They have the following meanings.
WARNING: Text set off in this manner indicates that failure to follow directions in the warning
could result in bodily harm or loss of life.
CAUTION: Text set off in this manner indicates that failure to follow directions could result in
damage to equipment or loss of information.
IMPORTANT: Text set off in this manner presents clarifying information or specific instructions.
NOTE: Text set off in this manner presents commentary, sidelights, or interesting points of information.

xii Compaq StorageWorks SSL2000 Series Library Maintenance and Service Guide
Compaq Technician Notes
WARNING: Only authorized technicians trained by Compaq should attempt to repair this
equipment. All troubleshooting and repair procedures are detailed to allow only
subassembly/module level repair. Because of the complexity of the individual boards and
subassemblies, no one should attempt to make repairs at the component level or to make
modifications to any printed wiring board. Improper repairs can create a safety hazard. Any
indications of component replacement or printed wiring board modifications may void any
warranty.
WARNING: To reduce the risk of personal injury from electrical shock and hazardous energy
levels, do not exceed the level of repair specified in these procedures. Because of the
complexity of the individual boards and subassemblies, do not attempt to make repairs at the
component level or to make modifications to any printed wiring board. Improper repairs could
create conditions that are hazardous.
WARNING: To reduce the risk of electric shock or damage to the equipment:
■If the system has multiple power supplies, disconnect power from the system by
unplugging all power cords from the power supplies.
■Do not disable the power cord grounding plug. The grounding plug is an important safety
feature.
■Plug the power cord into a grounded (earthed) electrical outlet that is easily accessible at
all times.
CAUTION: To properly ventilate your system, you must provide at least 12 inches (30.5 cm) of
clearance at the front and back of the computer.
CAUTION: The computer is designed to be electrically grounded. To ensure proper operation,
plug the AC power cord into a properly grounded AC outlet only.
Where to Go for Additional Help
In addition to this guide, the following information sources are available:
■User Documentation
■ Compaq Service Quick Reference Guide
■Service Training Guides
■Compaq Service Advisories and Bulletins
■Compaq QuickFind
■Compaq Insight Manager
■Compaq Download Facility: Call 1-281-518-1418

About This Guide xiii
Integrated Management Display
Some Compaq server models include a Compaq Integrated Management Display (IMD), an
integrated, 16x4 character display mounted on the front of the server. This display provides
easy-to-use menu-driven access to server information, including model number, LCD firmware
revision, and POST operations.
Telephone Numbers
For the name of your nearest Compaq Authorized Reseller:
■In the United States, call 1-800-345-1518
■In Canada, call 1-800-263-5868
For Compaq technical support:
■In the United States and Canada, call 1-800-386-2172
For Compaq technical support phone numbers outside the United States and Canada, visit the Compaq
website at http://www.compaq.com.

Chapter 1
System Description
Introduction
The Compaq StorageWorks SSL2000 Series is a tape library system that combines Advanced
Intelligent Tape™ (AIT) drive technology with advanced robotics. Designed for high duty-cycle
online and near-online applications, such as hierarchical storage management, it is a superior
performer in high-volume backup and archival service.
A Compaq StorageWorks SSL2000 Series Library (AIT Library) can be equipped with one or
two tape drives and a 20-slot tape cartridge magazine that includes one mail slot.
This chapter includes descriptions for:
■Library models
■Multi-unit Library systems
■Tape cartridge mail slot
■SCSI interface and bus performance considerations
■Shuttle lockdown mechanism
■Library features
■Advanced design features
Library Models
Libraries are currently available with:
■A tabletop or rackmount version
■One or two tape drives
■An optional Pass-Through Mechanism (PTM) for connecting up to five library units
■AIT 2 technology
■A Fast/Wide, Low Voltage Differential (LVD)/Single Ended (SE) SCSI-2 interface

1-2 Compaq StorageWorks SSL2000 Series LIbrary Maintenance and Service Guide
The drives used in the Library read from and write to 8 mm AIT 2 data tape cartridges with a
native capacity of 35 GB or 50 GB (see Table 1-1).
Table 1-1
Library Models
Model Number Configuration
175195-B21
175195-B22
1 Drive, AIT 2 50 GB, tabletop, LVD/SE
2 Drive, AIT 2 50 GB, tabletop, LVD/SE
175196-B21
175196-B22
1 Drive, AIT 2 50 GB, rackmount, LVD/SE
2 Drive, AIT 2 50 GB, rackmount, LVD/SE
Multi-Unit Library Systems
The Library features SmartScale Storage™ , an architecture that lets you combine multiple units
into an integrated library system. This architecture enables the robotics in each of the Library
units to exchange cartridges by means of a vertical PTM. Under the control of the unit you
configure to be the master unit, the PTM integrates the robotics in the individual slave units into
a single high-performance library robotics system. For more information, see Appendix C,
“Installation.”
The SmartScale Storage architecture gives you a truly scaleable library that can smoothly
expand to meet your growing storage needs. You can start with a system configured to your
present requirements, confident that as your storage needs evolve, adding units and extending
the PTM can easily modify the Library. Add drives for faster performance or magazine space
for greater capacity, as needed. Then just turn on the power, and immediately the system
updates the system map so the host is informed of the expanded capability. The SmartScale
Storage architecture has built-in redundancy so that if the master unit fails, a slave unit (slave 0)
can be configured to take over as the master unit. This is done without having to make hardware
changes except moving the motor cable to the new master.
Tape Cartridge Magazine Mail Slot
If your host software permits, you can use the front slot in the tape cartridge magazine (the first
slot you see when you open the door) as a mail slot for inserting or removing a single cartridge
without interrupting host operations in progress. The mail slot is implemented as the SCSI
IMPORT/EXPORT commands.
SCSI Interface
The unit presents the following to the host:
■A single SCSI medium changer device with a single SCSI medium transport element
■A number of SCSI storage elements equal to the total number of cartridge magazine slots
■A single SCSI import/export element
■A number of SCSI data transfer elements equal to the total number of drives in the Library

System Description 1-3
Multi-Server Data Sharing
A host computer with a SCSI controller connected to a bus is a SCSI initiator. The Library is a
SCSI target. SCSI rules permit multiple initiators on a single bus. Therefore, with the proper
host software, it is possible to connect multiple hosts to a single Library over a single SCSI bus.
This allows multiple hosts to operate the library robotics, loading and unloading cartridges as
each host requires.
In a library system with many drives, it might be desirable to use multiple SCSI buses for the
drives so the data transfer rate of the drives is not limited by bus bandwidth. Individual drives
can be connected to separate hosts. Using special software, one of the hosts can act as a master
server, processing all robotics commands and permitting several hosts to share a common
database.
SCSI Configuration
The Library standard SCSI interface is a Fast/Wide LVD/SE using high-density, 68-pin D-series
connectors. For more information, see Appendix C, “Installation.”
SCSI Bus Performance Considerations
Drives
With a standard Fast/Wide SCSI interface, each drive offers a sustained native data transfer rate
of 6 MB/s. In a two-drive unit, the total native rate is twice these rates. The rates for compressed
data are the native rates multiplied by the compression factor, which depends on file content, but
averages approximately 2:1.
Data Transfer Rate
The data transfer rate of the Library depends on the type of the AIT drive, number of drives, and
the number of drives connected to the SCSI bus. The library robotics imposes minimal loading
on the bus.
AIT-2 Fast/Wide @ 40 MB/s (burst)
AIT-2 Sustained @ 6 MB/s (native)
@ 12 MB/s (compressed)
Each drive has a maximum sustained rate of 12 MB/s with compressed data. As a result, the
transfer rate of a two-drive unit occupies the full bandwidth of the bus. Sharing a SCSI bus
among more than two drives degrades the maximum performance of the library system.
Internal Cabling Configuration
Each SCSI bus in the Library is wired separately. The library robotics and drive 1 share one bus;
add-on drives are connected to separate SCSI buses. SCSI jumper cables are available to allow
the drives and robotics of a unit to be daisy-chained to a single SCSI bus. For more detailed
information, see Appendix C, “Installation.”

1-4 Compaq StorageWorks SSL2000 Series LIbrary Maintenance and Service Guide
Bus Length Limitations
A single-ended Fast/Wide SCSI bus is limited in length to 10 ft (3 m), including cabling within
the units. A differential Fast/Wide SCSI bus can be up to 82 ft (25 m) in length, including
cabling within the units. If all devices and host adapter are LVD, length is limited to
39 ft (12 m).
Independent SCSI Buses for SE
For those two-drive applications where both AIT drives run in SCSI SE mode (rather than LVD
mode), each drive must be connected to its own SCSI bus.
Physical Configuration
The Library is configured as a tabletop model. To convert a tabletop Library to a rackmounted
model, order the Compaq Conversion Kit Part Number 175199-B21.
Shuttle Lockdown Mechanism
Compaq has installed a shuttle lockdown mechanism as a precautionary safety mechanism to
prevent damage to the Library during shipment from the factory. The mechanism is a spring-
loaded screw in the back of the Library that secures the shuttle to a bracket.
NOTE: You must release the shuttle lockdown mechanism before powering up the unit or it will not operate.
See Appendix C, “Installation,” for more information.

System Description 1-5
Library Features
Figures 1-1 through 1-3 shows some of the external features of the Library.
cc0052
Control Panel
Magazine Door
Power Switch
Figure 1-1. Library front view

1-6 Compaq StorageWorks SSL2000 Series LIbrary Maintenance and Service Guide
cc0053
1
2
3
4
6
5
Drv 1 + LIB
Expansion Ports
Diagnostic
Motor
Drive 2
Power Cord Connector
Lockdown Mechanism
Figure 1-2. Library rear view
Control Panel
The control panel features a 4-line by 20-character backlit liquid crystal display, four LED
indicators and four buttons. The buttons let you navigate through the menu structure to select
and display operating modes, device status, diagnostic and maintenance functions, device
history and error statistics, and library system configuration.
Display
The backlit, 4-line by 20-character control panel display provides a highly intelligible
presentation of drive and loader status, menu choices, and error messages. The scrolling feature
greatly expands the amount of information available to the operator.
Power Supply
The AC power switch is located on the front panel of the unit. The autoranging power supply
adjusts automatically to either of two operating voltage ranges. The ranges are 100-120 VAC
and 220-240 VAC. The power supply is capable of operating at 47 or 63 Hz without any
adjustment or modification. AC power is supplied to the power supply by a single
IEC-compatible socket, which can be connected to any properly grounded outlet.

System Description 1-7
Tape Cartridge Magazine
The polymer magazine fits into an extruded track, which assures precise positioning for the
library robotics (see Figure 1-3).
cc0054
Slot 18
Slot 0
Mail Slot
Figure 1-3. Tape cartridge magazine
The front slot in the magazine is a Mail Slot, used to add or remove cartridges without
interrupting library operation. You can remove the magazine through the front door, but it is
protected from tampering in either of two ways:
■An electronic combination lock, operated from the control panel
■The host issuing a SCSI PREVENT/ALLOW MEDIUM REMOVAL command
For more information on inserting and removing the magazine, see Chapter 2, “Operation.”

1-8 Compaq StorageWorks SSL2000 Series LIbrary Maintenance and Service Guide
Integral Fan Cooling
Each AIT drive contains a thermostat-controlled fan. In addition, a fan is mounted inside the
Library to prevent critical parts from overheating.
Robotics
The Library features Compaq Mainframe-Class™ Library Robotics. These advanced robotics
can load any of the cartridges stored in the magazine into any of the tape drives.
Bar Code Reader
A standard bar code reader is mounted on the cartridge shuttle. It reads bar code labels attached
to each cartridge, and maintains the bar code data in memory as part of the library system map.
Advanced Design Features
Embedded Diagnostics
The Library provides three levels of embedded diagnostics:
Power-On Self Test (POST ) — Performs various verification tests on the system’s
configuration, host interface and device control functions, as well as memory tests when you
power on the unit.
User Diagnostics — Lets you display and change configuration options. Selected from front
panel.
CE Diagnostics — Advanced diagnostics used by Customer Engineers (CEs) for servicing the
Library. Selected from front panel.
For more information on user diagnostics, see Appendix C, “Installation.”
Error Checking
The drives used in the Library use read while write data checking and error-correction code
(ECC) technology such as is used in audio CD, DVD, and laser discs.
Buffer
Drives are equipped with an 8-MB buffer.