HP P4000 Maintenance Manual page 20

IMPORTANT:
enclosure drive firmware.
Upgrading the SAS switch firmware
Upgrading the VC Flex- 1 0 firmware
Upgrading the storage blade firmware
If a volume is not replicated, upgrades to the storage blade firmware and OA firmware (BIOS)
will take the volume offline.
20 Maintaining the HP P4800 G2 solution
Be sure to first power down the disk enclosures before upgrading the disk