HP Surestore Disk Array 12h - And FC60 Service Manual page 59

Replace B) Replacing an Array Controller In an Array that IS NOT used as a boot device
and the Version of Firmware on the Replacement Array Controller DOES NOT Match
Version of Firmware on the Installed Array Controllers.
CAUTION! Controller firmware HP4x and any later versions have a different data map
format in NVRAM memory. Once you have HP4x or later, you can not "downgrade" to any
firmware version prior to HP4x without first completely backing up all data on the array,
including any meta-data, e.g., LUN and LVM configuration. After you have "downgraded"
the firmware and formatted the array, all meta-data and real data will need to be restored
from backup.
NOTE! This is an offline procedure. All I/O to the array will need to be suspended for
duration of this procedure.
Assumptions: Use this procedure if an existing array controller has failed, if the disk array a non-boot
device, and the replacement array controller DOES NOT have the same version of firmware as the installed
array controllers.
1. If replacement controller is new, install the controller batteries (supplied).
2. If replacement controller is NOT new, reset (disconnect and then re-connect) both batteries on the
replacement controller at the same time to erase NVRAM.
3. Verify which controller has failed by examining the logs using the logprint command. This is to
make sure you do not remove the functioning (good) controller.
4. Quiet (quiesce) or stop all I/Os, deactivate volume set, unmount file systems, stop traffic to the array.
5. Remove the "failed" controller. After Initialization, display panel shows "Ready."
CAUTION! It is very important that the array be in a "Ready" state. The array should
not present any warning (other than a single controller warning) statements at this
point.
HP SureStore E Disk Array 12H Controller
Firmware Download Procedure
59