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1. To offline HDD, shutdown server, unplug one of the RAID 1 HDD, example unplug HDD2.
2. Upgrade OS version, upgrade successful, shutdown server unplug the current HDD1 and plug in HDD2.
Power on server, access to webBIOS clear HDD2 RAID configuration, shutdown server plug in both HDDs, power on server access to webBIOS configure HDD2 as hot spare to rebuild.
3. If upgrade fail, reboot access to webBIOS clear HDD1 RAID configuration, shutdown server plug in both HDDs access to BIOS configure HDD1 as hot spare to rebuild.
Refer 4.5.4 Deleting a RAID Array & 4.5.1 Configuring a Hot Spare Drive.