4. Use the Storage Subsystem Profile or DS3500 Profile to ensure that the
following functions are enabled:
v For all DS3500 models, enable Media Scan both at the controller level and at
the LUN level.
v For all DS3500 models, enable the read/write cache. In addition, use the
Storage Subsystem Profile to ensure that cache is matched between the
controllers.
Set a regular schedule of periodic health check evaluations to keep the firmware
levels current and to preserve optimal data access and performance.
Hardware inspection
In addition to the health check process, regular hardware inspection and
maintenance helps to support the optimal performance of the storage
configuration. Periodically inspect the components of the storage configuration.
For best results, follow these guidelines:
v Maintain an up-to-date storage subsystem profile for the storage configuration.
Save the profile to a server disk that will remain accessible in case of a DS3500
storage configuration failure. Do not save the profile only to a LUN in the
storage subsystem.
v Develop a change-management plan. The plan should include schedules for
updating subsystem firmware and server host software.
Note: Some updates might require storage subsystem downtime.
v Use applicable IBM-approved cables for all situations. Note in the configuration
documentation whether any cables are not IBM-approved.
v Create and maintain a cabling diagram of the current configuration. Keep this
diagram updated as you make configuration changes, and keep the cabling
diagram available for review.
v Create and maintain a list of other components that are being used within the
cabling diagram (such as the host system and other attached devices).
v Ensure that all controllers and ESMs are correctly seated.
v Ensure that all drives are correctly seated.
v Ensure that cables are managed correctly.
v Ensure proper air flow and temperature for all components in the storage
configuration.
You can find details about many of these inspection and maintenance
responsibilities in other sections of this document.
In addition to these inspection and maintenance responsibilities, conduct training
for staff that support storage configurations. Although training is not a part of the
health check process, training reduces the potential for configuration problems and
contributes to the correct operation of the system.
Turning on the storage subsystem
This section contains instructions for turning on the storage subsystem under
normal situations. “Turning off the storage subsystem” on page 95 contains
instructions for turning off the storage subsystem under normal and emergency
situations. When you turn on and turn off the storage subsystem, be sure to use
82 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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