4. Use the Storage Subsystem Profile to verify that the following functions are
enabled:
v For all DS4000, DS5100, and DS5300 models, Media Scan should be
enabled both at the controller level and at the LUN level.
v For all DS4000, DS5100, and DS5300 models, the read/write cache should
be enabled. In addition, use the Storage Subsystem Profile to verify that
cache is matched between the controllers.
Web pages
IBM maintains pages on the World Wide Web where you can get the latest
technical information and download device drivers and updates.
For DS4000, DS5100, and DS5300 information, go to the following Web site:
www.ibm.com/servers/storage/support/disk/
For the latest information about operating system and HBA support, clustering
support, SAN fabric support, and Storage Manager feature support, see the
DS4000, DS5100, and DS5300 Interoperability Matrix at the following Web site:
www.ibm.com/servers/storage/disk/ds4000/interop-matrix.html
Hardware responsibilities
In addition to the Health Check steps described above, regular hardware inspection
and maintenance helps to support the optimal performance of your storage
configuration. You should periodically inspect the Fibre Channel components of your
storage configuration.
IBM suggests you follow these guidelines:
v Maintain an up-to-date storage subsystem profile for your storage configuration.
Save the profile to a server disk that will remain accessible in case of a 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 IBM-approved Fibre Channel cables for all situations. Note in your
configuration documentation whether any cables are not IBM-approved.
v Create and maintain a cabling diagram of the current SAN 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, Fibre Channel switches, and other
SAN attachments).
v Ensure that all ESMs are properly seated.
v Ensure that all drives are properly seated.
v Ensure that all SFP modules are properly seated.
v Confirm Fibre Channel cable loop size. (IBM specifications call for at least 3-inch
cable loops, but it is best practice to use 6-inch cable loops or longer.)
v Ensure proper Fibre Channel cable management.
Chapter 4. Operating the storage subsystem 129
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