Digital Equipment StorageWorks HSZ50 User manual

DIGITALStorageWorks
HSZ50ArrayController
HSOFVersion5.1
ServiceManual
Part Number: EK-HSZ50-SV.C01
March 1997
Software Version: HSOF Version 5.1
Digital Equipment Corporation
Ma
y
nard, Massachusetts

March, 1997
While Digital Equipment Corporation believes the information included in this manual
is correct as of the date of publication, it is subject to change without notice. DIGITAL
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. No responsibility is
assumed for the use or reliability of firmware on equipment not supplied by DIGITAL
or its affiliated companies. Possession, use, or copying of the software or firmware
described in this documentation is authorized only pursuant to a valid written license
from DIGITAL, an authorized sublicensor, or the identified licensor.
Commercial Computer Software, Computer Software Documentation and Technical
Data for Commercial Items are licensed to the U.S. Government with DIGITAL’s
standard commercial license and, when applicable, the rights in DFAR 252.227-7015,
“Technical Data—Commercial Items.”
© Digital Equipment Corporation 1997.
Printed in U.S.A.
All rights reserved.
Alpha, CI, DCL, DECconnect, DECserver, DIGITAL, DSSI, HSC, HSJ, HSD, HSZ,
MSCP, OpenVMS, StorageWorks, TMSCP, VAX, VAXcluster, VAX 7000, VAX
10000, VMS, VMScluster, and the DIGITAL logo are trademarks of Digital Equipment
Corporation. All other trademarks and registered trademarks are the property of their
respective holders.
This equipment has been 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 when the equipment is
operated in a commercial environment. 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. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense. Restrictions apply
to the use of the local-connection port on this series of controllers; failure to observe
these restrictions may result in harmful interference. Always disconnect this port as
soon as possible after completing the setup operation. Any changes or modifications
made to this equipment may void the user's authority to operate the equipment.

Warning!
This is a Class A product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.
Achtung!
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei
Betrieb dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer
für entsprechende Gegenmaßnahmen verantwortlich ist.
Avertissement!
Cet appareil est un appareil de Classe A. Dans un environnement résidentiel cet
appareil peut provoquer des brouillages radioélectriques. Dans ce cas, il peut être
demandé à l’ utilisateur de prendre les mesures appropriées.

v
Table of Contents
1 Troubleshooting
Introduction............................................................................................................1–2
Interpreting controller LED codes...........................................................................1–2
Troubleshooting HSZ50 controllers ........................................................................1–7
Troubleshooting when you cannot access host units......................................... 1–7
Troubleshooting on a DIGITAL UNIX system................................................. 1–8
Using the DIGITAL UNIX file utility..................................................... 1–9
OpenVMS host troubleshooting...................................................................... 1–10
Troubleshooting application errors................................................................. 1–11
Locating a device error .........................................................................1–11
Controller generated event.................................................................... 1–19
Locating a host bus error.......................................................................1–26
Command Timeout (Host system timeout) .............................................. 1–26
Select timeout (SCSI protocol timeout).................................................. 1–30
Identifying unit attention errors............................................................. 1–33
OpenVMS unit attention.......................................................................... 1–33
DIGITAL UNIX unit attention................................................................ 1–37
Using FMU to describe event log codes................................................................ 1–42
FMU Command Example ..................................................................... 1–44
Using FMU to Describe Recent Last Fail or Memory
System Failure Codes .................................................................................. 1–44
FMU Output Example........................................................................... 1–45
Testing disks (DILX)............................................................................................ 1–46
Running a quick disk test ............................................................................... 1–46
Running an initial test on all disks..................................................................1–47
Running a disk basic function test.................................................................. 1–49
Running an advanced disk test .......................................................................1–52
DILX error codes........................................................................................... 1–55

vi
DILX data patterns......................................................................................... 1–56
Monitoring system performance with the VTDPY utility...................................... 1–57
How to Run VTDPY...................................................................................... 1–57
Using the VTDPY Control Keys.................................................................... 1–58
Using the VTDPY Command Line................................................................. 1–58
How to Interpret the VTDPY Display Fields.................................................. 1–60
SCSI Host port Characteristics.............................................................. 1–60
Device SCSI Status............................................................................... 1–61
Unit Status (abbreviated) ...................................................................... 1–62
Unit Status (full)................................................................................... 1–65
Device Status........................................................................................ 1–68
Device SCSI Port Performance............................................................. 1–71
Help Example................................................................................................ 1–71
2 Replacing field-replaceable units
Introduction and precautions................................................................................... 2–2
Electrostatic Discharge .................................................................................... 2–2
Handling controllers or cache modules............................................................. 2–2
Handling the program card............................................................................... 2–2
Handling controller host-port cables: ............................................................... 2–3
Required tools.................................................................................................. 2–3
Replacing dual-redundant controllers and cache modules
using C_SWAP..................................................................................................... 2–3
Preparing the subsystem.......................................................................... 2–4
Removing the controller and cache modules........................................... 2–7
Reinstalling the controller subsystem components ................................ 2–12
Restarting the subsystem....................................................................... 2–16
Replacing a controller and cache module in a single
controller configuration...................................................................................... 2–18
Removing the controller and cache modules......................................... 2–18
Reinstalling controller subsystem components...................................... 2–21
Replacing dual-redundant controllers and cache modules
using the off-line method.................................................................................... 2–24
Removing the controller and cache....................................................... 2–24
Reinstalling subsystem components...................................................... 2–25
Replacing external cache batteries (ECBs)............................................................ 2–28
Replacing ECBs using the on-line method ..................................................... 2–28
Preparing the subsystem........................................................................ 2–28
Replacing the failed ECB...................................................................... 2–29
Reinstalling the modules....................................................................... 2–30
Restarting the subsystem....................................................................... 2–32

vii
Preparing to replace the second ECB .................................................... 2–33
Replacing the second ECB.................................................................... 2–33
Reinstalling the modules....................................................................... 2–34
Restarting the subsystem.......................................................................2–36
Replacing ECBs using the off-line method..................................................... 2–37
Replacing power supplies...................................................................................... 2–39
Cold-swap...................................................................................................... 2–39
Removing the power supply..................................................................2–39
Installing the new power supply............................................................ 2–40
Asynchronous swap method........................................................................... 2–41
Replacing storage devices..................................................................................... 2–42
Asynchronous disk drive swap ....................................................................... 2–42
Disk drive replacement procedure (3.5, 5.25-inch drives)............................... 2–42
Replacing tape drives............................................................................................ 2–44
Tape drive replacement procedure..................................................................2–44
Replacing solid-state disk and CD-ROM drives .................................................... 2–45
Solid-state disk and CD-ROM drive replacement
procedure..................................................................................................... 2–45
Replacing SCSI host cables................................................................................... 2–47
Replacing the SCSI host cables...................................................................... 2–47
Replacing SCSI device port cables........................................................................ 2–49
Replacing the device port cables.................................................................... 2–49
3 Installing and Upgrading
Introduction............................................................................................................3–2
Upgrading Array Controller software...................................................................... 3–3
Program card upgrade (single controller configuration)....................................3–3
Program card upgrade (dual-redundant configuration)......................................3–4
Upgrading controller software using the CLCP utility.............................................3–5
Invoking the CLCP utility................................................................................ 3–5
Code load methods...........................................................................................3–5
Single controller upgrade method.....................................................................3–6
Host port upgrade.............................................................................................3–7
Host download script requirements .........................................................3–8
Preparing the software image.................................................................. 3–8
Setting up the host...................................................................................3–9
Write enable the program card in the controller ......................................3–9
Running the CLCP utility...................................................................... 3–10
Maintenance terminal port upgrade................................................................ 3–13
System setup......................................................................................... 3–14
Write enable the program card in the controller ....................................3–16

viii
Running the CLCP utility ..................................................................... 3–16
The dual-redundant, sequential upgrade method ............................................ 3–19
Special considerations for the sequential code load
upgrade method.................................................................................. 3–19
Sequential upgrade procedure........................................................................ 3–21
The dual-redundant concurrent code load upgrade
method ........................................................................................................ 3–21
Considerations for the concurrent code load upgrade
method ........................................................................................................ 3–22
Concurrent code load upgrade procedure ....................................................... 3–24
Patching controller software ................................................................................. 3–25
Code patch considerations.............................................................................. 3–26
Listing patches............................................................................................... 3–26
Installing a patch............................................................................................ 3–28
Code patch messages ..................................................................................... 3–30
Formatting disk drives.......................................................................................... 3–32
Considerations for formatting disk drives....................................................... 3–33
Installing new firmware on a device ..................................................................... 3–35
Considerations for installing new device firmware......................................... 3–36
HSUTIL abort codes...................................................................................... 3–37
HSUTIL messages ......................................................................................... 3–37
Installing a controller and cache module in a single controller
configuration...................................................................................................... 3–41
Installing a second controller and cache module ................................................... 3–45
Installing a write-back cache module.................................................................... 3–48
Removing the controller ....................................................................... 3–48
Installing the write-back cache module................................................. 3–49
Adding Cache Memory......................................................................................... 3–50
Installing SIMM Cards................................................................................... 3–50
Installing power supplies ...................................................................................... 3–53
Power supply and shelf LED status indicators................................................ 3–53
Power supply installation procedure............................................................... 3–56
Installing storage building blocks.......................................................................... 3–57
SBB activity and fault indicators.................................................................... 3–58
Installing SBBs (except solid state disk and CD-ROM).................................. 3–60
Installing a solid state disk or CD-ROM......................................................... 3–60

ix
4 Moving storagesets and devices
Precautions for retaining data..................................................................................4–2
Moving storagesets .................................................................................................4–3
Moving storageset members....................................................................................4–6
Moving a single disk-drive unit...............................................................................4–8
Moving a tape drive, CD-ROM drive, or tape loader...............................................4–9
5 Removing
Removing a patch...................................................................................................5–2
Removing a controller and cache module................................................................ 5–5
Removing storage devices....................................................................................... 5–6
Removing disk drives.......................................................................................5–6
Removing solid state disks and CD-ROM drives.............................................. 5–7
Removing tape drives....................................................................................... 5–8
Appendix A
Instance, codes and definitions................................................................................A-2
Last fail codes......................................................................................................A-42
Repair action codes..............................................................................................A-91
Glossary
Index
Figures
Figure 2–1 Connecting a maintenance terminal..................................................... 2–4
Figure 2–2 Disconnecting the trilink connector..................................................... 2–6
Figure 2–3 Removing the program card................................................................2–8
Figure 2–4 Disconnecting the battery cable and disabling
the ECB................................................................................................................2–9
Figure 2–5 Removing controllers and cache modules.......................................... 2–10
Figure 2–6 Installing controllers and cache modules........................................... 2–13
Figure 2–7 Disabling the ECB ............................................................................ 2–19
Figure 2–8 Installing the program card................................................................ 2–21

x
Figure 2–9 Removing the power supply............................................................. 2–38
Figure 2–10 Power supply fault indicators.......................................................... 2–39
Figure 2–11 Removing a disk drive .................................................................... 2–41
Figure 2–12 Default indicators for 3.5- and 5.25-inch SBBs ............................... 2–42
Figure 2–13 OCP LED patterns .......................................................................... 2–43
Figure 2–14 Removing the CD-ROM drive......................................................... 2–44
Figure 2–15 Disconnecting the SCSI host cable.................................................. 2–46
Figure 2–16 Removing the volume shield........................................................... 2–48
Figure 2–17 Access to the SCSI cables............................................................... 2–49
Figure 3–1 Single controller code load method..................................................... 3–7
Figure 3–2 Host port code load operation.............................................................. 3–8
Figure 3–3 Write enable the program card.......................................................... 3–10
Figure 3–4 Terminal port code load operation..................................................... 3–13
Figure 3–5 Binary transfer protocol selection...................................................... 3–15
Figure 3–6 The sequential upgrade method......................................................... 3–22
Figure 3–7 The concurrent upgrade method........................................................ 3–25
Figure 3–8 Installing new firmware on a disk or tape drive................................. 3–37
Figure 3–9 Installing an SBB battery module...................................................... 3–44
Figure 3–10 Installing controller power supplies................................................. 3–44
Figure 3–11 Installing a single controller (SW800 cabinet)................................. 3–45
Figure 3–12 Cache configurations for cache Version 3 ....................................... 3–53
Figure 3–13 Installing a power supply ................................................................ 3–58
Figure 3–14 Typical 3.5-inch and 5.25-inch disk drive SBBs.............................. 3–59
Figure 3–15 Typical 5.25-inch CD-ROM SBB.................................................... 3–60
Figure 3–16 Typical 3.5-inch tape drive SBB ..................................................... 3–60
Figure 4–1 Moving a storageset from one subsystem to
another................................................................................................................. 4–3
Figure 4–2 Moving storageset members................................................................ 4–6
Figure 5–1 Removing a 3.5-inch disk drive........................................................... 5–7
Figure 5–2 OCP LED patterns .............................................................................. 5–8
Tables
Table 1–1 Solid controller LED codes.................................................................. 1–3
Table 1–2 Flashing controller LED codes............................................................. 1–4
Table 1–3 DILX data patterns............................................................................. 1–57
Table 1–4 VTDPY control keys.......................................................................... 1–59
Table 1–5 VTDPY commands............................................................................ 1–60
Table 2–1 Required tools...................................................................................... 2–3

xi
Table 2–2 ECB status indicators ......................................................................... 2–16
Table 2–3 ECB status indicators......................................................................... 2–26
Table 2–4 ECB status indicators ......................................................................... 2–36
Table 3–1 Abort codes........................................................................................ 3–39
Table 3–2 SCSI ID Slots..................................................................................... 3–43
Table 3–3 ECB status indicators ......................................................................... 3–46
Table 3–4 Adding cache memory capacity..........................................................3–53
Table 3–5 Power supply status indicators -- SW300 cabinet................................ 3–55
Table 3–6 Shelf and single power supply status indicators --
SW500, SW800 cabinets .................................................................................... 3–56
Table 3–7 Shelf and dual power supply status indicators --
SW500, SW800 cabinets .................................................................................... 3–57
Table 3–8 Storage SBB Status Indicators............................................................ 3–62
Table A–1 Instance, codes ....................................................................................A-2
Table A–2 Executive services last failure codes..................................................A-42
Table A–3 Value-added services last failure codes.............................................. A-46
Table A–4 Device services last failure codes ......................................................A-56
Table A–5 Fault manager last failure codes.........................................................A-64
Table A–6 Common library last failure codes.....................................................A-67
Table A–7 DUART services last failure codes.................................................... A-67
Table A–8 Failover control last failure codes......................................................A-68
Table A–9 Nonvolatile parameter memory failover control
last failure codes.................................................................................................A-69
Table A–10 Facility lock manager last failure codes........................................... A-71
Table A–11 Integrated logging facility last failure codes ....................................A-72
Table A–12 CLI last failure codes.......................................................................A-72
Table A–13 Host interconnect services last failure codes.................................... A-74
Table A–14 SCSI host interconnect services last failure
codes..................................................................................................................A-76
Table A–15 Host interconnect port services last failure
codes..................................................................................................................A-77
Table A–16 Disk and tape MSCP server last failure codes.................................. A-80
Table A–17 Diagnostics and utilities protocol server last
failure codes.......................................................................................................A-84
Table A–18 System communication services directory last
failure code......................................................................................................... A-85
Table A–19 SCSI host value-added services last failure
codes..................................................................................................................A-85
Table A–20 Disk inline exerciser (DILX) last failure codes ................................A-86
Table A–21 Tape inline exerciser (TILX) last failure codes................................ A-87
Table A–22 Device configuration utilities
(CONFIG/CFMENU) last failure codes ..............................................................A-89
Table A–23 Clone unit utility (CLONE) last failure codes..................................A-89

xii
Table A–24 Format and device code load utility (HSUTIL)
last failure codes................................................................................................. A-89
Table A–25 Code load/code patch utility (CLCP) last
failure codes....................................................................................................... A-90
Table A–26 Induce controller crash utility (CRASH) last
failure codes....................................................................................................... A-90
Table A–27 Repair action codes ......................................................................... A-91

xiii
Related documents
The following table lists documents that contain information related
to this product.
Document title Part number
DECevent Installation Guide AA–Q73JA–TE
Stora
g
eWorks BA350–MA Controller Shelf User's
Guide EK–350MA–UG
Stora
g
eWorks Confi
g
uration Mana
g
er for DEC
OSF/1 Installation Guide AA–QC38A–TE
Stora
g
eWorks Confi
g
uration Mana
g
er for DEC
OSF/1 System Manager's Guide for HSZterm AA–QC39A–TE
StorageWorks Solutions Configuration Guide EK–BA350–CG
Stora
g
eWorks Solutions Shelf and SBB User's
Guide EK–BA350–UG
Stora
g
eWorks Solutions SW300-Series RAID
Enclosure Installation and User's Guide EK–SW300–UG
Stora
g
eWorks SW500-Series Cabinet Installation
and User's Guide EK–SW500–UG
Stora
g
eWorks SW800-Series Data Center Cabinet
Installation and User's Guide EK–SW800–UG
The RAIDBOOK—A Source for RAID
Technology RAID Advisor
y
Board
Polycenter Console Manager User's Guide Computer Associates
VAXcluster S
y
stems Guidelines for VAXcluster
System Configurations EK–VAXCS–CG
16-Bit SBB User’s Guide EK-SBB16-UG
7-Bit SBB Shelf (BA356 Series) User’s Guide EK-BA356-UG
SBB User’s Guide EK-SBB35-UG

HSZ50 Array Controller Service Manual
1
Troubleshooting
Interpreting controller LED codes
Troubleshooting controllers
Using FMU to describe event log codes
Testing disk drives
Monitoring subsystem performance

1–2 Troubleshooting
Service Manual HSZ50 Array Controller
Introduction
This chapter is designed to help you quickly isolate the source of any
problems you might encounter when you service the StorageWorks
HSZ50 controllers, and take the necessary steps to correct the
problems.
Interpreting controller LED codes
This section provides information on how to interpret controller
LED codes. The operator control panel (OCP) on each HSZ
controller contains a green reset LED and six device bus LEDs.
These LEDs light in patterns to display codes when there is a
problem with a device configuration, a device, or a controller.
• During normal operation, the green reset LED on each
controller flashes once per second, and the device bus LEDs are
not lit.
• The amber LED for a device bus lights continuously when the
installed devices do not match the controller configuration, or
when a device fault occurs.
• The green reset LED lights continuously and the amber LEDs
display a code when a controller problem occurs. Solid LED
codes indicate a fault detected by internal diagnostic and
initialization routines. Flashing LED codes indicate a fault that
occurred during core diagnostics.
Look up the LED code that is showing on your controller in Table
1–1 or Table 1–2 to determine its meaning and find the corrective
action. The symbols used in the tables have the following meanings:
O LED on
P LED off
M LED flashing

Troubleshooting 1–3
HSZ50 Array Controller Service Manual
Table 1–1 Solid controller LED codes
Code Description of Error Corrective Action
O O O O O O O DAEMON hard error Replace controller
module.
O O O O O O P Repeated firmware bugcheck Replace controller
module.
O O O O O P O NVMEM version mismatch Replace program card
with later version of
firmware.
O O O O O P P NVMEM write error Replace controller
module.
O O O O P O O NVMEM read error Replace controller
module.
O O O O P O P NMI error within firmware
bugcheck Reset the controller.
O O O O P P O Inconsistent NVMEM
structures repaired Reset the controller.
O O O O P P P Bugcheck with no restart Reset the controller.
O O O P O O O Firmware induced restart
following bugcheck failed to
occur
Replace controller
module.
O O O P O O P Hardware induced restart
following bugcheck failed to
occur
Replace controller
module.
O O O P O P O Bugcheck within bugcheck
controller Reset controller module.
O O O P P O O NVMEM version is too low Verify the card is the
latest revision. If the
problem still exists,
replace the module.
O O O P P O P Program card write fail Replace the card.
O O O P P P O ILF, INIT unable to allocate
memory Reset the controller.
O O O P P P P Bugcheck before subsystem
initialization completed Reset the controller.
O P P P P P P No program card seen Try the card in another
module. If the problem
follows the card, replace
the card. Otherwise,
replace the controller.

1–4 Troubleshooting
Service Manual HSZ50 Array Controller
Table 1–2 Flashing controller LED codes
Code Description of Error Corrective Action
O P P P P P M Program card EDC error Replace program card.
O P P P M P P Timer zero in the timer chip
will run when disabled Replace controller module.
O P P P M P M Timer zero in the timer chip
decrements incorrectly Replace controller module.
O P P P M M P Timer zero in the timer chip
did not interrupt the processor
when requested
Replace controller
module.
O P P P M M M Timer one in the timer chip
decrements incorrectly Replace controller module.
O P P M P P P Timer one in the timer chip
did not interrupt the processor
when requested
Replace controller
module.
O P P M P P M Timer two in the timer chip
decrements incorrectly Replace controller module.
O P P M P M P Timer two in the timer chip
did not interrupt the processor
when requested
Replace controller
module.
O P P M P M M Memory failure in the I/D
cache Replace controller module.
O P P M M P P No hit or miss to the I/D
cache when expected Replace controller module.
O P P M M P M One or more bits in the
diagnostic registers did not
match the expected reset
value
Replace controller
module.
O P P M M M P Memory error in the
nonvolatile journal SRAM Replace controller module.
O P P M M M M Wrong image seen on
program card Replace program card.
O P M P P P P At least one register in the
controller DRAB does not
read as written
Replace controller
module.
O P M P P P M Main memory is fragmented
into too many sections for the
number of entries in the good
memory list
Replace controller
module.
O P M P P M P The controller DRAB or
DRAC chip does not arbitrate
correctly
Replace controller
module.

Troubleshooting 1–5
HSZ50 Array Controller Service Manual
Code Description of Error Corrective Action
O P M P P M M The controller DRAB or
DRAC chip failed to detect
forced parity, or detected
parity when not forced
Replace controller
module.
O P M P M P P The controller DRAB or
DRAC chip failed to verify
the EDC correctly
Replace controller
module.
O P M P M P M The controller DRAB or
DRAC chip failed to report
forced ECC
Replace controller
module.
O P M P M M P The controller DRAB or
DRAC chip failed some
operation in the reporting,
validating, and testing of the
multibit ECC memory error
Replace controller
module.
O P M P M M M The controller DRAB or
DRAC chip failed some
operation in the reporting,
validating, and testing of the
multiple single-bit ECC
memory error
Replace controller
module.
O P M M P P P The controller main memory
did not write correctly in one
or more sized memory
transfers
Replace controller
module.
O P M M P P M The controller did not cause
an I-to-N bus timeout when
accessing a “reset” host port
chip
Replace controller
module.
O P M M P M P The controller DRAB or
DRAC chip did not report an
I-to-N bus timeout when
accessing a “reset” host port
chip.
Replace controller
module.
O P M M P M M The controller DRAB or
DRAC chip did not interrupt
the controller processor when
expected
Replace controller
module.
O P M M M P P The controller DRAB or
DRAC chip did not report an
NXM error when nonexistent
memory was accessed
Replace controller
module.

1–6 Troubleshooting
Service Manual HSZ50 Array Controller
Code Description of Error Corrective Action
O P M M M P M The controller DRAB or
DRAC chip did not report an
address parity error when one
was forced
Replace controller
module.
O P M M M M P There was an unexpected
nonmaskable interrupt from
the controller DRAB or
DRAC chip during the DRAB
memory test
Replace controller
module.
O P M M M M M Diagnostic register indicates
there is no cache module, but
an interrupt exists from the
non-existent cache module
Replace controller
module.
O M P P P P P The required amount of
memory available for the
code image to be loaded from
the program card is
insufficient
Replace controller
module.
O M P P P P M The required amount of
memory available in the pool
area is insufficient for the
controller to run
Replace controller
module.
O M P P P M M The required amount of
memory available in the
buffer area is insufficient for
the controller to run
Replace controller
module.
O M P P M P P The code image was not the
same as the image on the card
after the contents were copied
to memory
Replace controller
module.
O M P P M P M Diagnostic register indicates
that the cache module does
not exist, but access to that
cache module caused an error
Replace controller shelf
backplane.
O M P P M M P Diagnostic register indicates
that the cache module does
not exist, but access to that
cache module did not cause
an error
Replace controller shelf
backplane.
O M M P P P P The journal SRAM battery is
bad Replace controller module.