Digital Equipment SA7x User manual

SA7xEnclosure
ServiceManual
Order Number: EK–OSA7X–SM. C01
This manual explains how to operate, maintain, troubleshoot, and repair
the SA7x family of disk enclosures: the SA70, SA71, SA72, and SA73.
Digital Equipment Corporation
Maynard, Massachusetts

October 1993
While Digital believes the information included in this publication is correct as of the date of
publication, it is subject to change without notice.
Digital Equipment Corporation makes no representations that the interconnection of its products
in the manner described in this document will not infringe existing or future patent rights, nor
do the descriptions contained in this document imply the granting of licenses to make, use, or sell
equipment or software in accordance with the description.
NOTE: This equipment generates, uses, and may emit radio frequency energy. The equipment has
been type tested and found to comply with the limits for a Class A digital device pursuant to Part
15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference in a commercial installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications.
Any changes or modifications made to this equipment may void the user’s authority to operate the
equipment.
Operation of this equipment in a residential area may cause interference in which case the user,
at his own expense, will be required to take whatever measures may be required to correct the
interference.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions
as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software
clause at DFARS 252.227-7013.
©Digital Equipment Corporation 1991, 1992, 1993.
All Rights Reserved.
Printed in the United States of America.
DEC, DSA, DSDF, HSC, HSC50, HSC70, KDA, KDA50, KDB50, KDM, MicroVAX, PDP-11, RA, SA,
SDI, UDA, UNIBUS, VAXsimPLUS, and the DIGITAL logo are trademarks of Digital Equipment
Corporation.
This document was prepared using VAX DOCUMENT Version 2.1.

Contents
Preface ............................................................ ix
1 Introducing the SA7x Enclosure
1.1 SA7xEnclosureOverview ..................................... 1–1
1.2 RA7x and SA7x Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.3 SA7xSpecifications .......................................... 1–9
1.4 UserPrecautions ............................................ 1–10
1.4.1 DataRecovery ........................................... 1–10
1.4.2 Recommended Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . 1–11
1.4.3 Electrostatic Discharge Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–11
2 SA7x Technical Description
2.1 SA7xChassis............................................... 2–1
2.2 SA7xFrame................................................ 2–3
2.3 SA7xFanAssembly.......................................... 2–5
2.4 SA7x OCP and Transition Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.5 SA7xPowerSupply .......................................... 2–10
2.6 SA7x Enclosure Internal Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
3 Installing the SA7x
3.1 SA7xInstallationOverview.................................... 3–1
3.1.1 PowerandSafety......................................... 3–1
3.1.2 Recording Disk Drive Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.2 Selecting Line Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.3 Performing a Post-Installation Checkout and Power-Up . . . . . . . . . . . . . . 3–2
3.4 SettingDriveUnitNumbers ................................... 3–5
3.5 Installing an Add-On SA7x Enclosure in an SA900 Storage Array . . . . . . 3–6
3.5.1 General Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.6 Preparing the SA900 Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9
3.7 Guide Rail Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–11
3.8 Left Position Guide Rail Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . 3–11
3.9 Right Position Guide Rail Plate Installation . . . . . . . . . . . . . . . . . . . . . . . 3–13
3.10 Preparing the SA7X Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–14
3.11 Installing the SA7X Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–15
3.11.1 Completing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–19
iii

4 Operating the SA7x
4.1 SA7x Switches and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.1.1 Using the Switches and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.1.2 Using Drive Power Switches and Indicators . . . . . . . . . . . . . . . . . . . . 4–4
4.2 Using SA7x Rear Panel Switches and Indicator . . . . . . . . . . . . . . . . . . . . . 4–5
4.3 Applying Power to the SA7x Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.4 Placing RA7x Drives On Line and Off Line . . . . . . . . . . . . . . . . . . . . . . . . 4–7
4.4.1 PlacingaDriveOnLine.................................... 4–7
4.4.2 TakingaDriveOffLine.................................... 4–8
5 Troubleshooting the SA7x
5.1 IdentifyingProblems ......................................... 5–1
5.2 Troubleshooting a Dead Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.2.1 If the Fault Indicator Is Lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.2.2 If the Fault Indicator Is Not Lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.3 Troubleshooting a Flashing Drive Power Indicator . . . . . . . . . . . . . . . . . . 5–3
5.4 Troubleshooting Excessive Drive Errors or a Fault Condition . . . . . . . . . . 5–5
5.5 ReadingOCPErrorCodes..................................... 5–5
5.6 Troubleshooting a Drive Not Visible to the Controller . . . . . . . . . . . . . . . . 5–6
5.7 TroubleshootingtheOCP...................................... 5–6
6 Replacing RA7x Disk Drives
6.1 Installing and Removing an RA7x Disk Drive . . . . . . . . . . . . . . . . . . . . . . 6–2
6.1.1 Recording RA7x Disk Drive Serial Numbers . . . . . . . . . . . . . . . . . . . . 6–3
6.1.2 Reversing the RA70 Shoe Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
6.1.3 Installing an RA7x Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–6
6.1.4 Removing an RA7x Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–6
6.2 Installing and Removing a Drive Position Filler . . . . . . . . . . . . . . . . . . . . 6–8
7 Replacing SA7x FRUs
7.1 RequiredTools.............................................. 7–2
7.2 Power Supply Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
7.2.1 RemovingthePowerSupply ................................ 7–4
7.2.2 Installing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
7.3 OCP Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
7.3.1 RemovingtheOCP........................................ 7–4
7.3.2 InstallingtheOCP........................................ 7–5
7.4 TB2 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6
7.4.1 Removing Transition Board 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6
7.4.2 Installing Transition Board 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8
7.5 Transition Board 1 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . 7–9
7.5.1 Removing Transition Board 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9
7.5.2 Installing Transition Board 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9
7.6 Fan Assembly Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 7–10
7.6.1 RemovingtheFanAssembly ................................ 7–10
7.6.2 Installing the Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–10
7.7 Remote OCP Cable Removal and Installation . . . . . . . . . . . . . . . . . . . . . . 7–11
7.7.1 Removing a Remote OCP Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–12
7.7.2 Installing a Remote OCP Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13
7.8 Power Harness Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . 7–15
7.8.1 RemovingaPowerHarness................................. 7–15
iv

7.8.2 Installing a Power Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–16
7.9 SDI Cable Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–18
7.9.1 Removing an Enclosure SDI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–18
7.9.2 Installing an Enclosure SDI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–20
7.10 SA7xCheckout.............................................. 7–20
A SA7x Internal Cabling
B Environmental Stabilization
C Part Numbers
D OCP Error Codes
E RA7x Error Rates
E.1 TypeIDataErrors........................................... E–1
E.2 Type II Data and Header Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–1
E.3 Loss-of-PositionerErrors ...................................... E–2
E.4 SoftErrors................................................. E–2
E.5 Unrecoverable Error (Hard Data Error) . . . . . . . . . . . . . . . . . . . . . . . . . . . E–2
E.6 BadBlockReplacementRate................................... E–2
E.7 RA7xSystemErrorRates ..................................... E–2
F Revision Support
Index
Figures
1–1 SA7xEnclosure .......................................... 1–2
1–2 RA70DiskDrive ......................................... 1–3
1–3 RA71 Through RA73 Disk Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
1–4 Using the ESD Grounding Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–12
2–1 SA70EnclosureAssembly .................................. 2–2
2–2 Removing and Replacing a Disk Drive in the SA70 Enclosure . . . . . . . 2–4
2–3 SA7xFanAssembly....................................... 2–5
2–4 SA7x Enclosure Front Panel and OCP . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2–5 OCP, Transition Board Assembly, and Associated Circuits Block
Diagram................................................ 2–9
2–6 SA7x Enclosure Rear Panel and Power Supply . . . . . . . . . . . . . . . . . . 2–11
2–7 PowerSupplyBlockDiagram................................ 2–13
3–1 SA7xEnclosureFrontPanel ................................ 3–4
3–2 Storage Device Add-On Sequence for the SA900 Storage Array (Front
View) .................................................. 3–7
3–3 SA7x Front Clamping Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
3–4 SA900 and SA7x Chassis Retaining Brackets . . . . . . . . . . . . . . . . . . . 3–9
3–5 SA7x Enclosure Guide Rail Assembly Installation . . . . . . . . . . . . . . . . 3–10
v

3–6 SA900MountingRailHoles................................. 3–12
3–7 Installing the SA7x Enclosure in the SA900 . . . . . . . . . . . . . . . . . . . . 3–16
3–8 SA900 SDI Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–18
3–9 SA900 Power Cords—SA7x Enclosures . . . . . . . . . . . . . . . . . . . . . . . . 3–20
4–1 SA7xEnclosureFrontPanel ................................ 4–2
4–2 SA7xEnclosureRearPanel................................. 4–6
5–1 SA7xEnclosureFrontPanel ................................ 5–4
6–1 SA70Enclosure .......................................... 6–3
6–2 RA7x Disk Drive Serial Number Location . . . . . . . . . . . . . . . . . . . . . . 6–4
6–3 Reversing the RA7x Shoe Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–5
6–4 ReplacingRA70DiskDrive ................................. 6–7
7–1 SA7xEnclosure .......................................... 7–2
7–2 Cabinet with Stabilizer Foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3
7–3 SA7x Enclosure Rear Panel and Power Supply . . . . . . . . . . . . . . . . . . 7–5
7–4 TransitionBoard2........................................ 7–7
7–5 RemovingTB1........................................... 7–8
7–6 Installing the Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–11
7–7 RemovingAcousticPanels .................................. 7–13
7–8 CableRouting ........................................... 7–14
7–9 SA7x Enclosure Power Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–17
7–10 SA7x Enclosure Internal SDI Cables . . . . . . . . . . . . . . . . . . . . . . . . . . 7–19
A–1 SA7x Enclosure Cabling Block Diagram . . . . . . . . . . . . . . . . . . . . . . . A–2
A–2 PowerHarnessCabling .................................... A–3
A–3 OCP to Transition Board Assembly to Disk Drive Cabling . . . . . . . . . . A–4
A–4 TB2toFan.............................................. A–5
A–5 Rear Bulkhead to Drive SDI Connections . . . . . . . . . . . . . . . . . . . . . . A–6
A–6 4-PinDCPowerConnector.................................. A–7
Tables
1RelatedCourses.......................................... x
2RelatedDocumentation .................................... x
1–1 Authorized Disk Drive Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1–2 RA7x Fixed Disk Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1–3 SA7xConfigurations ...................................... 1–7
1–4 SA7x Enclosure Recommended Environmental Limits . . . . . . . . . . . . . 1–9
1–5 SA7x Enclosure Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–9
3–1 RA7xDriveUnitNumbers ................................. 3–5
3–2 H9A00ExternalSDICables ................................ 3–17
4–1 SA7x Switch and Indicator Functions . . . . . . . . . . . . . . . . . . . . . . . . . 4–3
4–2 OCP Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
4–3 Power Supply Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
5–1 SA7x Problems and Troubleshooting References . . . . . . . . . . . . . . . . . 5–1
6–1 Authorized Disk Drives Installations . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
A–1 FanConnections ......................................... A–7
B–1 Thermal Stabilization Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . B–1
C–1 SAxxxCablePartNumbers................................. C–1
vi

C–2 H9A00 External SDI Cable Part Numbers . . . . . . . . . . . . . . . . . . . . . . C–1
C–3 SAxxx Assembly Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–2
C–4 RA7xPartNumbers....................................... C–2
D–1 OCPErrorCodes......................................... D–1
E–1 RA7xErrorRateTable..................................... E–1
E–2 Allowable RA7x System Error Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . E–3
F–1 VAX Diagnostics for RA71–RA73 Drives . . . . . . . . . . . . . . . . . . . . . . . F–1
F–2 Retired VAX Supervisor Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . F–2
F–3 Operating Systems for RA71–RA73 Drives . . . . . . . . . . . . . . . . . . . . . F–2
F–4 SDI Controllers for RA71–RA73 Drives . . . . . . . . . . . . . . . . . . . . . . . . F–2
vii

Preface
The SA7x Enclosure Service Manual explains how to install, operate,
troubleshoot, and perform field level repairs of the SA7x family of enclosures: the
SA70, SA71, SA72, and SA73. The manual is intended for Digital Multivendor
Customer Services engineers.
The SA70, SA71, SA72, and SA73 enclosures are physically identical. They are
differentiated only by the RA7x disk drives they contain:
• The SA70 accommodates one to four RA70 disk drives (280 MB each).
• The SA71 accommodates one to four RA71 disk drives (700 MB each).
• The SA72 accommodates one to four RA72 disk drives (1 GB each).
• The SA73 accommodates one to four RA73 disk drives (2 GB each).
Conventions
Special terminology used in the publication includes:
The term ‘‘SA7x’’ refers to the SA70, SA71, SA72, and SA73 enclosures
collectively.
The term ‘‘RA7x’’ refers to the RA70, RA71, RA72, and RA73 disk drives
collectively.
The following notations are used in this manual:
•Note—Identifies information that is of special interest.
•CAUTION—Identifies information that pertains to the protection of the
equipment or loss of data.
•WARNING—Identifies information that pertains to your safety.
ix

Related Courses and Documentation
Table 1 lists the Digital courses related to the SA7x enclosure.
Table 1 Related Courses
Title Order Number
AC Power & Grounding EY–B730–PO
DSA Architecture Level 1 Course EY–5593E–IV
Electrical Safety EY–B737E–PO
Electrical Safety and Lockout/Tagout Procedures EY–E038E–SO
RA70/BA27 Disk Drive Maintenance Course EY–5805E–IV
VAXsimPLUS Maintenance Course EY–7687E–PO
Table 2 lists the documentation related to the SA7x enclosure.
Table 2 Related Documentation
Document Title Document Order
Number
DSA Troubleshooting Flowchart EK–DSATF–TM
Disk Drive Technical Description Manual EK–ORA70–TD
BA27 Maintenance Print Set MP–01429
SAxxx Configuration Guide EK-SAXXX–CG
RA7x Disk Drive Service Manual EK–ORA7X–SM
RA7x/SA7x Pocket Reference Guide EK–RSA7X–PG
RA70 Field Maintenance Print Set MP–01428
RA71/RA72 Support Print Set EM–01434
RA71/RA72 Field Maintenance Print Set MP–01434
RA73 Support Print Set EM–01439
RA73 Field Maintenance Print Set MP–01439
SA7x Enclosure User Guide EK–OSA7X–UG
SA7x Support Print Set EM–01435
SA7x Field Maintenance Print Set MP–01435
x

1
Introducing the SA7x Enclosure
This chapter is an overview of the SA7x enclosure, lists SA7x configurations and
specifications, and discusses user precautions.
1.1 SA7x Enclosure Overview
The term ‘‘SA7x’’ refers to the family of enclosures that includes:
• The SA70—Accommodates one to four RA70 disk drives (280 MB each)
• The SA71—Accommodates one to four RA71 disk drives (700 MB each)
• The SA72—Accommodates one to four RA72 disk drives (1 GB each)
• The SA73—Accommodates one to four RA73 disk drives (2 GB each)
For all of these designations, the enclosure itself is physically identical. What
differentiates an SA70 enclosure from an SA71 enclosure is the type of drives
installed in each (RA70s and RA71s). See Figure 1–1 for an illustration of an
SA7x enclosure.
Table 1–1 lists the the types of disk drives that are authorized for installation in
each SA7x enclosure.
Table 1–1 Authorized Disk Drive Installations
Enclosure RA70 RA71 RA72 RA73
SA70 Yes No No No
SA71 Yes Yes Yes Yes1
SA72 Yes Yes Yes Yes1
SA73 Yes Yes Yes Yes
1A maximum of three drives may be installed.
The SA7x enclosure provides mounting space, power, cooling, and control for up
to four RA7x disk drives. Each disk drive is independently powered and operated
by the enclosure.
The enclosure is installed as a component in a storage array cabinet.
The RA7x disk drive used in the SA7x enclosure is a random-access Winchester
technology drive with a formatted storage capacity of 280 MB to 2 GB. The drive
features modular components that can be replaced with minimum down time.
Figure 1–2 shows an RA70 disk drive. Figure 1–3 shows an RA71 through RA73
disk drive.
Introducing the SA7x Enclosure 1–1

Introducing the SA7x Enclosure
1.1 SA7x Enclosure Overview
Figure 1–1 SA7x Enclosure
RIGHT REAR
DISK DRIVE
POSITION
LEFT REAR
DISK DRIVE
POSITION
FAN
TRANSITION
BOARD 2
OPERATOR
CONTROL
PANEL
RA70 DISK
DRIVE SHOWN
FRONT
COVER
RIGHT FRONT
DISK DRIVE
POSITION
LEFT FRONT
DISK DRIVE
POSITION
DRIVE POWER
SWITCH PANEL
FRAME
CHASSIS
POWER
SUPPLY
CXO-1845D_S
TRANSITION
BOARD 1
MOUNTING
SCREWS
REAR
COVER
(NOT
SHOWN)
You can combine SA7x enclosures into shadow sets. When using shadow sets,
remember that when replacing the power supply or transition boards 1 or 2, you
need to remove the power from the enclosure.
RA7x disk drive can be used with any disk drive controller using a standard
disk interface (SDI), including KDA50, KDB50, or KDM50 controller modules,
hierarchical storage controllers (HSCs), and UDA controllers. The drive is
compatible with the Digital Storage Architecture (DSA) and Mass Storage Control
Protocol (MSCP).
1–2 Introducing the SA7x Enclosure

Introducing the SA7x Enclosure
1.1 SA7x Enclosure Overview
Figure 1–2 RA70 Disk Drive
HDA
CHASSIS
CHASSIS
SHOE
PLATE
SHOE
PLATE
ELECTRONIC
CONTROL
MODULE (ECM)
SET
J1 8-PIN SDI
CONNECTOR
(PORT A)
J2 8-PIN SDI
CONNECTOR
(PORT B)
J3 20-PIN REMOTE
OPERATOR CONTROL
PANEL CONNECTOR
J4 4-PIN
POWER
CXO-1878B_S
HDA
SERIAL
NUMBER
LOCATION
FRONT PANEL
CONTROLS AND
INDICATORS
SERIAL
NUMBER
LABEL
Introducing the SA7x Enclosure 1–3

Introducing the SA7x Enclosure
1.1 SA7x Enclosure Overview
Figure 1–3 RA71 Through RA73 Disk Drives
FRONT VIEW
BOTTOM VIEW
REAR VIEW
CXO-3518A-MC
SHOE
PLATE
8-PIN
SDI-PORT A
8-PIN
SDI-PORT B
20-PIN
OCP
4-PIN
POWER
1–4 Introducing the SA7x Enclosure

Introducing the SA7x Enclosure
1.1 SA7x Enclosure Overview
The major subassemblies of the SA7x enclosure are:
• Chassis
• Frame
• Operator control panel (OCP)
• Transition board 1 (TB1)
• Transition board 2 (TB2)
• Power supply
• Fan assembly
• Enclosure-internal cables
Figure 1–1 shows the major subassemblies of the SA7x enclosure. Except for the
RA70 disk drive description, Figure 1–1 is accurate for all SA7x enclosures.
The frame slides into the chassis and contains the mounting facilities for the
other subassemblies. The disk drives fit into recesses located in the front and
rear of the frame. The OCP is mounted above the front disk drives and plugs
into TB1. TB1 interfaces the OCP to TB2. TB2 is located above the front disk
drives and interfaces drive signals through TB1 to the OCP. The power supply
is located in the rear of the frame, below the rear disk drives. The fan assembly
is fitted into the central portion of the frame. Interconnecting cables for the
subassemblies run along the outer sides of the frame behind acoustic paneling.
RA7x disk drives may be mounted in any of the four disk drive positions.
Installation procedures suggest to install the first two drives in the rear positions
and the second two drives in the front positions.
Caution
The SA7x enclosure will accommodate a single RA7x disk drive. However,
if only one drive is installed in the enclosure, a drive position filler is
required to route cooling air and prevent overheating. See Section 6.2 for
instructions on installing and removing a drive position filler.
The disk drive is installed in an enclosure with the rear panel of the drive, which
contains interface connectors, facing outward. The drives are operated from four
sets of switches and indicators on the enclosure OCP, one set for each disk drive
in the enclosure.
SDI bus cables from the disk drives are routed inside the enclosure to a cable
bulkhead at the top rear of the enclosure.
The enclosure power supply provides operating power to the major subassemblies
of the enclosure. The rear panel of the power supply contains the Master On/Off
switch for the enclosure.
Each RA7x disk drive is powered and controlled independently. A drive can be
operated with other disk drive positions unoccupied or while maintenance is
being performed on another drive. The power switches for the disk drives are
located on the front panel of the enclosure. Each drive power switch contains a
symbol to indicate its associated drive and an indicator that lights when power is
applied to the drive.
Introducing the SA7x Enclosure 1–5

Introducing the SA7x Enclosure
1.1 SA7x Enclosure Overview
The fan assembly circulates cooling air throughout the frame of the SA7x
enclosure. The air is drawn in through holes in the front panel on the enclosure
and is exhausted through holes in the rear panel.
The SA7x enclosure meets the following environmental and safety standards:
• DEC Standard 102 for environment
• DEC Standard 103 for electromagnetic emissions
• DEC Standard 104 for computer room noise level
• DEC Standard 119 for product safety
• National and international regulatory agency requirements, including FCC,
UL, IEC, CSA, and VDE
Your Digital sales representative can answer specific questions related to the
various environmental and safety standards.
1.2 RA7x and SA7x Configurations
Tables 1–2 and 1–3 show authorized RA7x disk drive and SA7x enclosure
configurations.
The description column of the RA7x configuration table contains the following
information:
Authorized installation:
Factory installation—Only installed at the factory.
Field add-on—Only installed in the field.
Enclosure:
Enclosures in which the disk drive may be installed.
Table 1–2 RA7x Fixed Disk Configurations
RA7x Disk
Drive Description
Formatted
Storage
Capacity
RA70–A Field add-on: SA70 options in storage arrays. 0.28 GB
RA70E–SA Factory installation: MicroVAX 3500, 3600, and 3900 0.28 GB
RA70E–SF Field add-on: MicroVAX 3500, 3600, and 3900 0.28 GB
RA71–AF Factory installation: SA71 enclosure 0.70 GB
RA71–AK Field add-on: SA71 enclosure 0.70 GB
RA72–AF Factory installation: SA71 enclosure 1.0 GB
RA72–AK Field add-on: SA72 enclosure 1.0 GB
RA73–AF Factory installation: SA73 enclosure 2.0 GB
RA73–AK Field add-on: SA73 enclosure 2.0 GB
The description column of the SA7x configuration table contains the following
information:
Authorized installation:
Factory installation—Only installed at the factory.
Field add-on—Only installed in the field.
1–6 Introducing the SA7x Enclosure

Introducing the SA7x Enclosure
1.2 RA7x and SA7x Configurations
Storage Array:
Systems and storage arrays in which the disk drive or enclosure may be
installed.
Table 1–3 SA7x Configurations
Enclosure Description
RA70
Disk
Drive
RA71
Disk
Drive
RA72
Disk
Drive
RA73
Disk
Drive
Formatted
Storage
Capacity
SA70–HK Field add-on
SA550/SA650/SA8501
120-240 Vac, 50-60 Hz
2 0 0 0 0.56 GB
SA70–JK Field add-on
SA550/SA650/SA8501
120-240 Vac, 50-60 Hz
4 0 0 0 1.12 GB
SA70–LK Storage array building block
DECsystem 5800/VAX 60002
120-240 Vac, 50-60 Hz
2 0 0 0 0.56 GB
SA70–MK Storage array building block
DECsystem 5800/VAX 60002
120-240 Vac, 50-60 Hz
4 0 0 0 1.12 GB
SA71–CK Field add-on
SA550/SA650/SA850
120-240 Vac, 50-60 Hz
0 1 0 0 0.70 GB
SA71–EK Field add-on
SA900
120-240 Vac, 50-60 Hz
0 1 0 0 0.70 GB
SA71–FK Field add-on
SA900
120-240 Vac, 50-60 Hz
0 4 0 0 2.8 GB
SA71–GK Factory installation
SA900
120-240 Vac, 50-60 Hz
0 1 0 0 0.70 GB
SA71–HK Factory installation
SA900
120-240 Vac, 50-60 Hz
0 4 0 0 2.8 GB
SA71–JK Field add-on
SA550/SA650/SA850
120-240 Vac, 50-60 Hz
0 4 0 0 2.8 GB
SA71–LK Field add-on
SA600/SA800
120-240 Vac, 50-60 Hz
0 1 0 0 0.70 GB
SA71–MK Field add-on
SA600/SA800
120-240 Vac, 50-60 Hz
0 4 0 0 2.8 GB
SA72–CK Field add-on
SA550/SA650/SA850
120-240 Vac, 50-60 Hz
0 0 1 0 1.0 GB
1To install in an SA600 or SA800 storage array first upgrade the storage array as described in Chapter 5.
2Adding the first SA7x to a VAX 6000 or DECsystem 5800 system without internal storage devices requires an upgrade
kit: 60 Hz system—Upgrade Kit 62X34–UA
50 Hz system—Upgrade Kit 62X34–UB
Continued on next page
Introducing the SA7x Enclosure 1–7

Introducing the SA7x Enclosure
1.2 RA7x and SA7x Configurations
Table 1–3 (Continued) SA7x Configurations
Enclosure Description
RA70
Disk
Drive
RA71
Disk
Drive
RA72
Disk
Drive
RA73
Disk
Drive
Formatted
Storage
Capacity
SA72–EK Field add-on
SA900
120-240 Vac, 50-60 Hz
0 0 1 0 1.0 GB
SA72–FK Field add-on
SA900
120-240 Vac, 50-60 Hz
0 0 4 0 4.0 GB
SA72–GK Factory installation
SA900
120-240 Vac, 50-60 Hz
0 0 1 0 1.0 GB
SA72–HK Factory installation
SA900
120-240 Vac, 50-60 Hz
0 0 4 0 4.0 GB
SA72–JK Field add-on
SA550/SA650/SA850
120-240 Vac, 50-60 Hz
0 0 4 0 4.0 GB
SA72–LK Field add-on
SA600/SA800
120-240 Vac, 50-60 Hz
0 0 0 1 1.0 GB
SA72–MK Field add-on
SA600/SA800
120-240 Vac, 50-60 Hz
0 0 4 0 4.0 GB
SA73–CK Field add-on
SA550/SA650/SA850
120-240 Vac, 50-60 Hz
0 0 1 0 2.0 GB
SA73–EK Field add-on
SA900
120-240 Vac, 50-60 Hz
0 0 0 1 2.0 GB
SA73–FK Field add-on
SA900
120-240 Vac, 50-60 Hz
0 0 0 4 8.0 GB
SA73–GK Factory installation
SA900
120-240 Vac, 50-60 Hz
0 0 0 1 2.0 GB
SA73–HK Factory installation
SA900
120-240 Vac, 50-60 Hz
0 0 0 4 8.0 GB
SA73–JK Field add-on
SA550/SA650/SA850
120-240 Vac, 50-60 Hz
0 0 0 4 8.0 GB
SA73–LK Field add-on
SA600/SA800
120-240 Vac, 50-60 Hz
0 0 0 1 2.0 GB
SA73–MK Field add-on
SA600/SA800
120-240 Vac, 50-60 Hz
0 0 0 4 8.0 GB
1–8 Introducing the SA7x Enclosure

Introducing the SA7x Enclosure
1.3 SA7x Specifications
1.3 SA7x Specifications
Recommended environmental limits for operating the SA7x enclosure are listed in
Table 1–4. General specifications for the SA7x enclosure are shown in Table 1–5.
Caution
For the SA7x enclosure and installed RA7x disk drives to perform at
the optimal level and maintain high reliability, they should be used in
environments recommended in the following tables.
Table 1–4 SA7x Enclosure Recommended Environmental Limits
Characteristic Min. Max. Units
Operating temperature 65
18 75 24 Degrees Fahrenheit
Degrees Celsius
Operating temperature rate of change – 5.4
3Degrees per hour Fahrenheit Degrees per hour Celsius
Operating temperature step change – 5.4
3Degrees per hour Fahrenheit Degrees per hour Celsius
Operating relative humidity 40 60 Percent relative humidity
(noncondensing)
Operating relative humidity rate of change – 10 Percent relative humidity
(noncondensing) per hour
Storage temperature 65
18 85 29 Degrees Fahrenheit Degrees Celsius
Storage humidity – 50 Percent relative humidity
(noncondensing)
Table 1–5 SA7x Enclosure Specifications
Characteristic Specification
Number of disk drive positions Four
Maximum formatted storage capacity:
SA70 enclosure
SA71 enclosure
SA72 enclosure
SA73 enclosure
1.12 GB
2.8 GB
4.0 GB
8.0 GB
Dimensions (nominal) 26.7 cm (10.5 in) high
22.2 cm (8.75 in) wide
71.1 cm (28 in) deep
Weight (nominal):
SA70 enclosure
SA71, SA72, or SA73 enclosures
21 kg (46 lb) empty
40 kg (88 lb) with four disk drives
21 kg (46 lb) empty
31.7 kg (72 lb) with four disk drives
Continued on next page
Introducing the SA7x Enclosure 1–9

Introducing the SA7x Enclosure
1.3 SA7x Specifications
Table 1–5 (Continued) SA7x Enclosure Specifications
Characteristic Specification
Operating temperature +10° C to +40° C (+50° F to +104°
F). Derate 1.8° C for each 1,000 m
altitude or 1.0° F for each 1,000 ft
altitude.
Operating humidity 10% to 85% @ maximum wet bulb
temperature +32° C (+90° F) and
minimum dew point of +2° C (+36° F)
Operating altitude Up to 2,400 m (8,000 ft)
Nonoperating temperature -40° C to +66° C (-40° F to +151° F)
Nonoperating relative humidity 8% to 80% relative humidity,
noncondensing
Nonoperating altitude 4,900 m (16,000 ft)
Shock and vibration Complies with DEC Standard 102
Enclosure acoustic noise
(with four RA7x disk drives) Complies with DEC Standard 102
Fan operating parameters:
Low speed operation Below +28° C (+82° F), +/- 1° C (1.8°
F)
High speed operation Above +30° C (+86° F), +/- 1° C (1.8°
F)
Nominal airflow through the enclosure Between 45 and 65 cubic ft per
minute
Input power requirements (47 to 63 Hz) 4.6 A @ 100 to 120 Vac (60 Hz), 2.3 A
@ 220 to 240 Vac (50 Hz)
1.4 User Precautions
Digital recommends that certain precautions be taken to protect equipment and
user data. These precautions involve backup methods, recommended operating
temperatures, and electrostatic discharge (ESD) protection, all of which are
discussed in this section.
1.4.1 Data Recovery
Data is not recoverable from an inoperable head disk assembly (HDA). Therefore,
it is your responsibility to make sure data is protected using proper backup
procedures. Digital recommends the following backup methods for RA7x disk
drives:
• File duplication—This method normally involves copying data onto removable
media, such as magnetic tape.
• Journaling—This method is recommended for files in a transaction processing
application. Journaling allows reconstruction of files up to the last checkpoint
or backup.
1–10 Introducing the SA7x Enclosure