Digital Equipment EK-SFXXS-SG-003 User manual


DECarray Service Guide
EK–SFXXS–SG–003
Digital Equipment Corporation

Second Edition, May 1992
Third Edition, June 1993
The information in this document is subject to change without notice and should not
be construed as a commitment by Digital Equipment Corporation. Digital Equipment
Corporation assumes no responsibility for any errors that may appear in this document.
Copyright © Digital Equipment Corporation 1993
All Rights Reserved.
Printed in U.S.A.
The postpaid Reader’s Comment Card included in this document requests the user’s
critical evaluation to assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation: DEC, DECUS, DSSI,
KFMSA, KFQSA, MicroVAX, MicroVAX II, MicroVAX 3xxx, MicroVMS, MSCP, PDP, Q-
BUS, TMSCP, UNIBUS, VAX, VAX 4000, VAX 6000, VAX 9000, VAXserver 3xxx, VMS,
XMI, and the DIGITAL logo.
All other trademarks and registered trademarks are the property of their respective
holders.

Contents
About This Guide ix
1 Introduction
1.1 DECarray Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.2 Storage Enclosure Overview . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.3 Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–13
2 Theory of Operation
2.1 Overview ........................................ 2–1
2.2 SF3x Series Storage Enclosure . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.2.1 DSSINodeID .................................. 2–2
2.2.2 SF3x Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.2.1 Through-Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.2.2 Split-Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.3 Front Panel Controls, Labels, and Indicators . . . . . . . . . . . 2–6
2.2.3.1 Operator Control Panel (OCP) . . . . . . . . . . . . . . . . . . . . 2–8
2.2.3.2 DC Power Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
2.2.4 Rear Panel Controls and Indicators . . . . . . . . . . . . . . . . . . 2–11
2.3 SF7x Series Storage Enclosure . . . . . . . . . . . . . . . . . . . . . . . 2–14
2.3.1 DSSINodeID .................................. 2–14
2.3.2 SF7x Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.3.2.1 Through-Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.3.2.2 Split-Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.3.3 Front Panel Controls, Labels, and Indicators . . . . . . . . . . . 2–18
2.4 Service Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19
iii

iv Contents
3 Troubleshooting
3.1 Subsystem Fault Verification . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.2 FaultIsolation.................................... 3–2
3.2.1 Troubleshooting the DECarray . . . . . . . . . . . . . . . . . . . . . . 3–5
3.2.1.1 Introduction.................................. 3–5
3.2.1.2 Configuration Verification . . . . . . . . . . . . . . . . . . . . . . . 3–5
3.2.2 Troubleshooting the Storage Enclosure . . . . . . . . . . . . . . . 3–6
3.2.2.1 Introduction.................................. 3–6
3.2.2.2 Configuration Verification . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.2.3 Optional Fault Isolation Steps with the DSSI Bus Meter . 3–7
3.3 Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
4 DECarray FRU Removal and Replacement
4.1 Doors........................................... 4–1
4.2 PowerController .................................. 4–4
4.3 DSSI Interconnect Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7
5 SF3x Storage Enclosure FRU Replacement
5.1 Warm Swap of Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
5.1.1 Obtaining Current Disk ISE Parameters . . . . . . . . . . . . . . 5–6
5.1.2 Warm Swap and Repair Procedures . . . . . . . . . . . . . . . . . . 5–10
5.1.3 Restoring the Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–14
5.1.4 Testing the Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–17
5.1.5 Mounting the Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–19
5.2 Replacing the Operator Control Panel . . . . . . . . . . . . . . . . . . 5–19
5.3 Replacing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
5.4 Replacing the Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
5.5 Replacing the Transition Module . . . . . . . . . . . . . . . . . . . . . . 5–25
5.6 Replacing the Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–27
5.7 Cable Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . 5–28
5.7.1 Replacing the AC Power Cord . . . . . . . . . . . . . . . . . . . . . . 5–29
5.7.2 Replacing the OCP to TM Cable . . . . . . . . . . . . . . . . . . . . 5–31
5.7.3 Replacing the Power Harness . . . . . . . . . . . . . . . . . . . . . . 5–34
5.7.4 Replacing the Internal DSSI Cables . . . . . . . . . . . . . . . . . . 5–36
5.8 Replacing the DC Switch Module . . . . . . . . . . . . . . . . . . . . . . 5–39

Contents v
5.9 Postrepair Checkout and Power-Up . . . . . . . . . . . . . . . . . . . . 5–41
5.9.1 From the Rear of the Storage Array . . . . . . . . . . . . . . . . . 5–41
5.9.2 From the Front of the Storage Array . . . . . . . . . . . . . . . . . 5–42
6 SF7x Storage Enclosure FRU Replacement
6.1 Warm Swap of Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
6.1.1 Obtaining Current Disk ISE Parameters . . . . . . . . . . . . . . 6–5
6.1.2 Warm Swap and Repair Procedures . . . . . . . . . . . . . . . . . . 6–9
6.1.3 Restoring the Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–19
6.1.3.1 HDA Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–19
6.1.3.2 Drive Module Replaced . . . . . . . . . . . . . . . . . . . . . . . . . 6–20
6.1.3.3 Restoring the Disk ISE Parameters . . . . . . . . . . . . . . . . 6–21
6.1.3.4 Testing the Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–23
6.1.3.5 Mounting the Disk ISE . . . . . . . . . . . . . . . . . . . . . . . . . 6–25
6.2 ReplacingtheOCP................................. 6–26
6.3 Replacing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . 6–29
6.4 Replacing the Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 6–32
6.5 Replacing the Transition-Termination Module . . . . . . . . . . . . 6–35
6.6 Replacing the Drive DC Power Switch . . . . . . . . . . . . . . . . . . 6–38
6.7 Cable Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . 6–42
6.7.1 Replacing the AC Power Cord . . . . . . . . . . . . . . . . . . . . . . 6–43
6.7.2 Replacing the OCP to TTM Cable . . . . . . . . . . . . . . . . . . . 6–45
6.7.3 Replacing the Power Harness . . . . . . . . . . . . . . . . . . . . . . 6–48
6.7.4 Replacing the OCP Cables . . . . . . . . . . . . . . . . . . . . . . . . . 6–53
6.7.5 Replacing the Internal DSSI Cables . . . . . . . . . . . . . . . . . . 6–57
6.8 Postrepair Checkout and Power-Up . . . . . . . . . . . . . . . . . . . . 6–64
6.8.1 From the Rear of the Storage Array . . . . . . . . . . . . . . . . . 6–64
6.8.2 From the Front of the Storage Array . . . . . . . . . . . . . . . . . 6–66
A Recommended Spare Parts

vi Contents
B DECarray Cabling Information
B.1 Single-System Configurations for DECarray with SF7x
Enclosures ....................................... B–1
B.2 DSSI VAXcluster Configurations . . . . . . . . . . . . . . . . . . . . . . B–16
B.3 Stripe Set Configurations with SF7x Enclosures . . . . . . . . . . B–28
B.4 DECarray Configurations with SF3x Enclosures in
Through-BusMode................................. B–29
B.5 DECarray Configurations with SF3x Enclosures in Split-Bus
Mode ........................................... B–36
Glossary
Index
Examples
5–1 SHOWDEVICE................................... 5–6
5–2 SHOWCLUSTER ................................. 5–7
5–3 SETHOST/DUP................................... 5–8
5–4 ANALYZE/SYSTEM................................ 5–9
5–5 PARAMS Dialog Restoring Disk ISE Parameters . . . . . . . . . . 5–15
5–6 RunningDRVTST ................................. 5–17
6–1 SHOWDEVICE................................... 6–5
6–2 SHOWCLUSTER ................................. 6–6
6–3 SETHOST/DUP................................... 6–7
6–4 ANALYZE/SYSTEM................................ 6–8
6–5 PARAMS Dialog Restoring Disk ISE Parameters . . . . . . . . . . 6–22
6–6 RunningDRVTST ................................. 6–24
Figures
1–1 Front View of the DECarray . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1–2 SF3x Series Storage Enclosure . . . . . . . . . . . . . . . . . . . . . . . 1–7
1–3 SF7x Series Storage Enclosure . . . . . . . . . . . . . . . . . . . . . . . 1–8
2–1 SF3x DSSI Node ID Switches . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2–2 Front View of the SF3x Storage Enclosure (with cover
removed) ........................................ 2–7

Contents vii
2–3 SF3x Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2–4 Rear Panel of the Storage Enclosure (with cover removed) . . 2–12
2–5 SF7x Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
4–1 Removing DECarray Door . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3
4–2 PowerController .................................. 4–6
5–1 SF3x Storage Enclosure Front View . . . . . . . . . . . . . . . . . . . . 5–3
5–2 SF3x Storage Enclosure Rear View . . . . . . . . . . . . . . . . . . . . 5–4
5–3 DiskISERemoval ................................. 5–11
5–4 Disk ISE Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–12
5–5 Removing and Replacing the Fan Assembly . . . . . . . . . . . . . . 5–23
5–6 Removing and Replacing the Transition Module . . . . . . . . . . 5–26
5–7 AC Power Cord Retainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–30
5–8 Removing and Replacing the OCP to TM Cable . . . . . . . . . . . 5–33
6–1 Storage Enclosure Exploded View . . . . . . . . . . . . . . . . . . . . . 6–3
6–2 Storage Enclosure Front View . . . . . . . . . . . . . . . . . . . . . . . . 6–10
6–3 Removing and Replacing a Disk ISE . . . . . . . . . . . . . . . . . . . 6–12
6–4 Disk ISE Skid Plate and Wedges . . . . . . . . . . . . . . . . . . . . . . 6–13
6–5 Separating the HDA from the Drive Module . . . . . . . . . . . . . 6–15
6–6 Disconnecting the Flex Circuit . . . . . . . . . . . . . . . . . . . . . . . . 6–16
6–7 Storage Enclosure OCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–19
6–8 OCPMSCPSwitch................................. 6–20
6–9 RemovingtheOCP................................. 6–28
6–10 Storage Enclosure Rear View . . . . . . . . . . . . . . . . . . . . . . . . . 6–30
6–11 Removing and Replacing the Fan Assembly . . . . . . . . . . . . . . 6–33
6–12 Removing and Replacing the Transition-Termination Module 6–36
6–13 Removing and Replacing the Drive DC Power Switches . . . . 6–40
6–14 AC Power Cord Retainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–44
6–15 Removing and Replacing the OCP to TTM Cable . . . . . . . . . . 6–47
6–16 Storage Enclosure Power Harness . . . . . . . . . . . . . . . . . . . . . 6–50
6–17 Removing the Acoustic Panels . . . . . . . . . . . . . . . . . . . . . . . . 6–56
6–18 Enclosure Internal DSSI Cables . . . . . . . . . . . . . . . . . . . . . . . 6–60
6–19 Enclosure Internal DSSI Cables (cont.) . . . . . . . . . . . . . . . . . 6–61
6–20 Enclosure Internal DSSI Cables (cont.) . . . . . . . . . . . . . . . . . 6–62
6–21 Storage Enclosure Rear View . . . . . . . . . . . . . . . . . . . . . . . . . 6–65
6–22 Storage Enclosure Front View . . . . . . . . . . . . . . . . . . . . . . . . 6–67

viii Contents
Tables
1–1 DECarray Storage Positions . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
1–2 DECarray Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
1–3 SF3x Storage Enclosure Specifications . . . . . . . . . . . . . . . . . . 1–9
1–4 SF7x Storage Enclosure Specifications . . . . . . . . . . . . . . . . . . 1–11
1–5 Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–13
2–1 SF3x Factory-set DSSI Node IDs . . . . . . . . . . . . . . . . . . . . . . 2–2
2–2 DSSI Node ID Switch Settings for SF3x Storage Enclosure . . 2–3
2–3 Operator Control Panel Functions . . . . . . . . . . . . . . . . . . . . . 2–9
2–4 Summary of Rear Panel Control/Indicator Functions . . . . . . . 2–11
2–5 DSSI ID Switch Settings (DSSI VAXcluster) . . . . . . . . . . . . . 2–14
2–6 DSSI ID Switch Settings (Single-System and Stripe Set) . . . . 2–15
3–1 Subsystem Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . 3–2
3–2 DECarray and Storage Enclosure Checklist . . . . . . . . . . . . . . 3–3
3–3 Storage Enclosure Troubleshooting Chart . . . . . . . . . . . . . . . 3–8
3–4 Disk ISE Fault Codes (for SF7x only) . . . . . . . . . . . . . . . . . . 3–11
4–1 DSSI Label Color Codes (Single-System Configurations) . . . . 4–8
4–2 DSSI Label Color Codes (DSSI VAXcluster Configurations) . . 4–9
4–3 DSSI Label Color Codes (Stripe Set Configurations) . . . . . . . 4–10
5–1 DRVTST Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18
6–1 Disk ISE OCP Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . 6–9
6–2 DRVTST Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–25
A–1 DECarray Recommended Spare Parts . . . . . . . . . . . . . . . . . . A–1
A–2 SF3x Recommended Spare Parts . . . . . . . . . . . . . . . . . . . . . . A–2
A–3 SF7x Recommended Spare Parts . . . . . . . . . . . . . . . . . . . . . . A–2
B–1 Cabling SF7x in DECarray Single-System Configurations . . . B–2
B–2 Cabling SF7x in DECarray DSSI VAXcluster Configurations B–17
B–3 Cabling SF7x in DECarray Stripe Set Configurations . . . . . . B–28
B–4 Cabling SF3x in DECarray Through-Bus Configurations . . . . B–29
B–5 Cabling SF3x in DECarray Split-Bus Configurations . . . . . . . B–36

AboutThisGuide
This guide provides information and procedures for servicing the SF7x
series storage enclosures in DECarray cabinets.
Chapter 1, Introduction, contains a product description and
specifications for the SF7x series storage enclosures and the DECarray
cabinets.
Chapter 2, Theory of Operation, describes the normal operation of the
SF7x series storage enclosures and the DECarray cabinets. This chapter
includes service guidelines.
Chapter 3, Troubleshooting, contains information for isolating
and troubleshooting faulty FRUs internal to the SF7x series storage
enclosures and the DECarray cabinets.
Chapter 4, DECarray FRU Removal and Replacement, contains the
step-by-step procedures for removing and replacing DECarray cabinet
FRUs.
Chapter 5, SF3x Storage Enclosure FRU Replacement, contains the
step-by-step procedures for removing and replacing FRUs internal to the
SF3x series storage enclosures and the DECarray cabinets.
Chapter 6, SF7x Storage Enclosure FRU Replacement, contains the
step-by-step procedures for removing and replacing FRUs internal to the
SF7x series storage enclosures and the DECarray cabinets.
The appendices provide a list of recommended spare parts, and cabling
information for the DECarray cabinets and SF-series storage enclosures.
ix

1
Introduction
This chapter provides an overview of the DECarray, and the SF3x and
SF7x series storage enclosures.
1.1 DECarray Overview
The DECarray is a storage rack cabinet designed to hold up to six SF-
series storage enclosures and one or two magazine tape ISEs.
The DECarray is intended to be installed on one or both sides of a system.
All operator control panels (OCPs) project through the front door of the
storage array to allow easy access.
The Digital Storage System Interconnect (DSSI) cables from the host
cabinet input/output (I/O) panel connect to the DSSI I/O panel at the
bottom rear of the storage array. The DSSI I/O panel supports as many
as 16 individual DSSI buses.
1–1

1–2 Introduction
Viewing the DECarray from the front, note that the SF-series storage
enclosures and magazine tape ISEs are arranged in the DECarray cabinet
as follows (Figure 1–1):
• The DECarray has four levels, each with two storage enclosure
positions. The levels are numbered from the bottom up. Viewing from
the front, odd-numbered positions are on the left, and even-numbered
positions are on the right.
Table 1–1 DECarray Storage Positions
Level Left Position Right Position
1 1 2
2 3 4
3 5 6
4 7 8
• Levels 1, 2, and 4 are reserved for SF-series storage enclosures only.
Storage enclosure upgrades are installed into these levels in the
following order: position 1, 2, 3, 4, 7, and 8.
• Level 3 is reserved for magazine tape ISEs. Magazine tape ISE
upgrades are installed first in position 5 then in position 6.
NOTE
The position numbers are visible on the right and left chassis side
rails when the front and rear doors of the storage array are open.
Specifications for the DECarray are shown in Table 1–2.

Introduction 1–3
Figure 1–1 Front View of the DECarray
DECarray
SHR-X1101A_91-DG
1
2
3
4
5
6
0
1
2
3
4
5
6
0
LEVEL 4
LEVEL 3
LEVEL 2
LEVEL 1

1–4 Introduction
Table 1–2 DECarray Specifications
Characteristic Specification
Dimensions (nominal) 152.4 cm (60.5 inches) H, 60.96 cm (24.0
inches) W, 76.2 cm (34.0 inches) D
Weight
Minimum configuration
Maximum configuration 228 kg (500 lb)
454 kg (1000 lb)
Agency compliance FCC, UL, IEC, CSA, and VDE
Temperature +10°C to +40°C (+50°F to +104°F).
Reduce rating by 1.8°C for each 1000
meters altitude
(1.0°F for each 1000 feet altitude)
Humidity 10% to 85% @ maximum wet bulb
temperature of +32°C (+90°F) and
minimum dew point of +2°C (+36°F)
Recommended Environmental Limits1
Operating environment
Temperature 18°C to 24°C (64.4°F to 75.2°F) with
an average rate of change of 3°C/hour
maximum and a step change of 3°C or less
Relative humidity 40% to 60% (noncondensing) with a step
change of 10% or less (noncondensing)
Altitude Up to 2400 meters (8000 feet)
Air quality (maximum
particle count) Not to exceed 500,000 particles per cubic foot of air at a size of 0.5 micron or larger
Air volume (at inlet) 50 cubic feet per minute (0.026 cubic
meters per second)
Nonoperating environment
Temperature -40°C to +66°C (-40°F to +151°F)
Relative humidity 10% to 80%, noncondensing
Altitude 4900 meters (16,000 feet)
Acoustic noise 6.8 bels
1These limits are for optimum equipment performance and reliability.

Introduction 1–5
Table 1–2 (Continued) DECarray Specifications
Characteristic Specification
Recommended Environmental Limits1
Nominal airflow through enclosure 360 to 520 cubic feet/minute
Input power requirements,
with SF35 (47 to 63 Hz normal
operation)
7.2 A (per phase) @ 100 to 120 Vac (60
Hz), 3.7 A (per phase) @ 220 to 240 Vac
(50 Hz)
Power requirements during disk
ISE spinup, with SF35 11.5 A @ 100 to 120 Vac (60 Hz), 6.1 A @ 220 to 240 Vac (50 Hz)
Input power requirements,
with SF72 (47 to 63 Hz normal
operation)
6.00 A (per phase) @ 100 to 120 Vac (60
Hz), 3.00 A (per phase) @ 220 to 240 Vac
(50 Hz)
Power requirements during disk
ISE spinup, with SF72 21.0 A @ 100 to 120 Vac (60 Hz), 10.5 A @ 220 to 240 Vac (50 Hz)
Input power requirements,
with SF73 (47 to 63 Hz normal
operation)
6.6 A (per phase) @ 100 to 120 Vac (60
Hz), 3.8 A (per phase) @ 220 to 240 Vac
(50 Hz)
Power requirements during disk
ISE spinup, with SF73 12.8 A @ 100 to 120 Vac (60 Hz),
7.5 A @ 220 to 240 Vac (50 Hz)
1These limits are for optimum equipment performance and reliability.

1–6 Introduction
1.2 Storage Enclosure Overview
The SF-series storage enclosures are available in two series; the SF3x
enclosure, which contains up to twelve half-height, 3 1/2-inch ISEs, and
the SF7x enclosure which contains up to four full-height, 5 1/4-inch ISEs.
Each disk ISE within an SF-series enclosure is independently controlled
from the OCP on the front of the enclosure. A power supply in the
enclosure provides the dc power and cooling for all disk ISEs installed in
the enclosure.
The SF3x storage enclosure (Figure 1–2) holds up to twelve RF3x series
ISEs. There are six slots in the front of the enclosure and six slots
in the rear. Disk ISEs installed in these slots plug directly into a
backplane, which is cabled to a connector tray on the top rear of the
storage enclosure.
The SF3x enclosure can be configured in through-bus or split-bus mode.
In through-bus mode, the six ISEs in the front of the SF3x enclosure are
connected to a single DSSI bus, and the six ISEs on the rear of the SF3x
enclosure are connected to a second DSSI bus. In split-bus mode, each end
of the enclosure (front and rear) is further divided into left-side ISEs and
right-side ISEs, each connected to a separate DSSI bus. Thus, in split-bus
mode there are four DSSI buses, each with three drives connected to it.
The SF7x series storage enclosure (Figure 1–3) holds either two or four
RF7x series ISEs. The ISEs in the SF7x storage enclosure can also be
configured in split-bus or through-bus mode. In through-bus mode, all
four disk ISEs are connected to a single DSSI bus. In split-bus mode, the
left-side ISEs are connected to one DSSI bus, while the right-side ISEs
are connected to a second DSSI bus.
Both SF-series storage enclosures have the following features:
• It can operate in through-bus or split-bus mode.
• Each disk ISE has its own set of switches and indicators on the OCP.
• The enclosure power supply provides operating power to all disk ISEs
and other subassemblies in the enclosure.
• The drive dc power switches for the disk ISEs are on the front panel
of the storage enclosure.
Specifications for the SF3x series storage enclosure are shown in
Table 1–3. Specifications for the SF7x series storage enclosure are shown
in Table 1–4.

Introduction 1–7
Figure 1–2 SF3x Series Storage Enclosure
A B C D E F
Front A B C D E F
Rear
Ready
Write
Protect
Fault
CD
B
A
EF
MA-0432-92.DG
AB C DEF
Rear
A B C DEF
Front

1–8 Introduction
Figure 1–3 SF7x Series Storage Enclosure
SHR_X1123C_89

Introduction 1–9
Table 1–3 SF3x Storage Enclosure Specifications
Characteristic
SF35
Specification
SF36
Specification
Formatted storage
capacity
SF3x–BK1
SF3x–HK2
SF3x–JK2
1.7 GB
5.1 GB
10.2 GB
3.9 GB
9.6 GB
19.2 GB
Dimensions H = 26.7 cm (10.5 inches)
W = 22.2 cm (8.75 inches)
D = 71.1 cm (28 inches)
Same as SF35
Weight
SF3x–BK1
SF3x–HK2
SF3x–JK3
26 kg (58 lb)
33 kg (73 lb)
40 kg (88 lb)
Same as SF35
Agency compliance FCC, UL, IEC, CSA, and VDE Same as SF35
Temperature +10°C to +40°C (+50°F to +104°F).
Decrease the rating 1.8°C for each
1000 meters altitude
(1.0°F for each 1000 feet altitude)
Same as SF35
Humidity 10% to 85% @ maximum wet bulb
temperature of +32°C (+90°F)
and minimum dew point of +2°C
(+36°F)
Same as SF35
Recommended Environmental Limits4
Operating
Environment
Temperature 18°C to 24°C (64.4°F to 75.2°F)
with an average rate of change
of 3°C/hour maximum and a step
change of 3°C or less
Same as SF35
1The SF3x–BK contains two disk ISEs.
2The SF3x–HK contains six disk ISEs.
3The SF3x–JK contains twelve disk ISEs.
4These limits are for optimum equipment performance and reliability.

1–10 Introduction
Table 1–3 (Continued) SF3x Storage Enclosure Specifications
Characteristic
SF35
Specification
SF36
Specification
Recommended Environmental Limits4
Relative humidity 40% to 60% (noncondensing)
with a step change of 10% or
less (noncondensing)
Same as SF35
Altitude Up to 2400 meters (8000 feet) Same as SF35
Air quality
(maximum
particle count)
Not to exceed 500,000 particles
per cubic foot of air at a size of 0.5
micron or larger
Same as SF35
Air volume (at
inlet) 50 cubic feet per minute (0.026
cubic meters per second) Same as SF35
Nonoperating
environment
Temperature -40°C to +66°C (-40°F to +151°F) Same as SF35
Relative humidity 10% to 80%, noncondensing Same as SF35
Altitude 4900 meters (16,000 feet) Same as SF35
SF3x enclosure
acoustic noise 6.2 bels Same as SF35
Nominal airflow
through enclosure 45 to 65 cubic feet/minute Same as SF35
SF3x Input power
requirements (47
to 63 Hz normal
operation)
3.0 A @ 100 to 120 Vac (60 Hz),
1.5 A @ 220 to 240 Vac (50 Hz) 3.2 A @ 100 to 120 Vac (60 Hz),
1.9 A @ 220 to
240 Vac (50 Hz)
SF3x Power
requirements during
disk ISE spinup
4.5 A @ 100 to 120 Vac (60 Hz),
2.3 A @ 220 to 240 Vac (50 Hz) Same as SF35
4These limits are for optimum equipment performance and reliability.