Servicing Notes - IBM TotalStorageFAStT900 User Manual

Attention:
the FAStT900 Storage Server, label controllers A and B with the white tape dots that
are included in the rack mounting assembly kit. To prevent data loss, the controllers
must be installed into their original location.
Figure 33. Controller status indicator lights

Servicing notes

Consider the following factors when servicing the controllers in the FAStT900
Storage Server:
v The FAStT900 Storage Server supports two controller CRUs, which attach to
v You can hot swap or replace a failed controller while the FAStT900 Storage
v If cache mirroring is enabled in redundant controllers and one controller fails, the
v If you replace the controller CRU and still experience problems, the FAStT900
v When a controller CRU fails, the fault light on the affected controller is lit. For
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IBM TotalStorageFAStT900 Fibre Channel Storage Server: User's Guide
If you are removing both controllers (controller A and controller B) from
hosts through Fibre Channel connections.
Server is in operation as long as the host has a Fibre Channel connection to the
functioning controller and is in a "passive" or "offline" status in the
storage-management software.
second controller assumes processing functions without data loss. However,
some or all data might be lost if cache mirroring is disabled and a failure occurs
before data is written from cache memory to disk.
Storage Server might have other defective components or connections. Check
the storage-management software for indications of other component failures.
more information about indicator lights, see "RAID controller indicator lights" on
page 22.