IBM Partner Pavilion DS4100 manual Replacing a RAID controller

Replacing a RAID controller

When instructed to do so by the DS4000 Storage Manager client, replace a RAID controller that has failed.

The procedure for replacing a failed controller is different for DS4100 single-controller and base (dual-controller) storage servers. If a controller in a DS4100 base storage server fails, you can replace the failed controller without interrupting data processing. The system will automatically update the firmware for the new controller to match the configuration database.

If the controller in a DS4100 single-controller storage server fails, you may need to manually update the firmware level to match the configuration database. If the firmware level of the new controller matches the configuration database, the storage server will boot normally after you install the new controller. If the firmware level does not match the database, the storage server will reach a stop state in the boot process, and you will need to manually update the firmware level to match the configuration database.

Attention: Because the replacement RAID controller has a different WWNN that the original RAID controller, you must perform the following tasks in order to bring the DS4100 single-controller storage server to running (optimal) state after you replace the RAID controller.

vReboot the host server that has mapped logical drives from the DS4100 single-controller storage server.

Rebooting the host server enables the multipath failover to recognize the logical drives under the new WWNN. In addition, if your multipath driver uses the WWNN of the controller as part of the LUN identification, you may have to reconfigure the LUN failover/failback path information.

vUse DS4000 Storage Manager to rediscover the new RAID controller.

To rediscover the new RAID controller, remove the existing DS4100 single-controller storage server entry in the management domain of the DS4000 Storage Manager client Enterprise Management Window (EMW), and then add the DS4100 single-controller storage server back into the management domain using the in-band or out-of-band management method. See step 6 on page 104.

vRe-enable the premium feature keys.

After you replace the RAID controller in a DS4100 single-controller storage server, all of the enabled premium feature keys are displayed as being out-of-compliance. Use the existing key files to re-enable the premium feature keys.

vIf you create zones using the RAID controller WWNN, update your zoning definitions with the new WWNN for the replacement RAID controller.

Important

The replacement RAID controller CRU does not come with a RAID controller cache battery installed, nor does it come with the mounting hardware that holds the battery in place inside the RAID controller. You must remove the cache battery that is inside the existing RAID controller that you are replacing, and install that battery inside the replacement RAID controller CRU, using the battery unit mounting hardware taken from the existing controller. The steps to remove and replace the battery are included in the following procedure.

96IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide