HP Surestore Disk Array 12h Controller Module Installation Guide - Page 27

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 off line 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. 27