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Chapter 6. Hardware maintenance
This chapter contains information to help you solve some of the simpler problems
that you might have with your storage subsystem. It contains the problem indicators
and error messages along with suggested actions to take to resolve the problem.
For instructions on how to obtain service and technical assistance for your storage
subsystem and other IBM products, see “Getting information, help, and service” on
page xxiii.
General checkout
Use the LEDs, the diagnostics and test information, and the Symptom-to-FRU index
to diagnose problems.
The PD maps found in the IBM TotalStorage DS4000 Problem Determination Guide
provide you with additional diagnostic aids.
Using the diagnostic hardware
The DS4500 Storage Subsystem comes with a wrap-plug adapter and LC coupler.
The wrap-plug adapter and LC coupler are used to identify fibre path problems. The
loopback and sendEcho tests are described in the IBM TotalStorage DS4000
Problem Determination Guide.
Solving problems
This section contains information to help you solve some of the problems you might
have with your storage subsystem. Table 24 contains the problem symptoms and
error messages, along with suggested actions to take to resolve problems.
Always use the DS4000 Storage Manager client to diagnose storage subsystem
problems and component failures and find solutions to problems that have definite
symptoms.
You can use Table 24, which contains the problem symptoms, along with suggested
actions as a guide for troubleshooting problems in addition to the DS4000 Storage
Manager Recovery Guru in the Subsystem Management window. Do not depend
solely Table 24 for a FRU replacement decision.
Note: Before any planned system shutdown or after any system additions,
removals, or modifications, save the storage subsystem profile as explained
in the DS4000 Storage Manager guide for your operating system. Save the
profile in a location other than in the logical drives created for the DS4500.
Table 24. Symptom-to-FRU index for DS4500
Problem Action/FRU
Controller LED (front cover)
is on.
1. Reseat Controller CRU.
2. If in passive mode, place Controller online using DS4000
Storage Manager GUI.
3. Controller CRU
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