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Replacing the battery in the RAID controller
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92
IBM TotalStorage FAStT600 Fibre Channel Storage Server: Installation and User's Guide
v If the Fault LED is on, the Host Loop LED and the Expansion Loop LED
stay off, or any other Fault LED is on, see the Storage Manager client for
problem determination, or contact IBM support.
25. See the Storage Manager client online Help for instructions on bringing the
controller online.
Each RAID controller contains a rechargeable battery that maintains the data in the
cache memory for three days without power to the unit.
Important: If you are replacing the battery in a FAStT600 single-controller storage
server (Model 6lU/6LX), complete the following steps before beginning
the replacement procedure:
v Schedule down time for the battery replacement, because the disk
will not be available during the procedure.
v Complete any necessary server preparation tasks.
v Save the configuration/profile.
v Use the Storage Manager client to flush and disable the cache on
the controller, using the following steps. Either check that the cache
LED on the back of the controller is off, or wait two to three minutes.
1. In the Logical/Physical View of the Subsystem Management
window, right-click any of the logical drive tree nodes and select
Change-->Cache Settings. A Change Cache Settings window
opens.
2. Click Select All to select all logical drives, and deselect all of the
Cache Setting Enable check boxes, then click OK. Click OK
when the Confirmation window opens.
Note: A progress window shows the modification progress. After
See the Storage Manager client online Help panels for more details
on disabling cache.
v Stop I/O to the storage server.
v Unmount any mapped LUNs from the storage server.
v Power down the FAStT600 single-controller storage server (Model
6LU/6LX).
Use the following procedure if the Storage Manager client instructs you to replace
the battery because the current battery has failed or is nearing its expiration date.
You can also use the Storage Manager client to check the status of the battery.
1. Check the Storage Manager client online Help for instructions on battery
replacement procedures. If you are using write-cache mirroring, this might
involve clearing cache memory on the RAID controller that contains the battery
that has failed. This is done by either placing the controller offline before
removing it from the FAStT600 server or turning off caching in the FAStT600
server, using the Storage Manager client. Follow the steps given in the
software procedure before you continue with this procedure.
the cache setting modification complete, click OK to close
the progress window and return to the Subsystem
Management window.
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