HP Surestore Disk Array 12h - And FC60 Service Manual page 273

When replacing a defective DC power harnesses, you must:
1. Stop all host I/O activity to the disk array.
2. Make sure that all data is out of write cache memory. The Fast Cache Write LED will be
off when all data has been written from write cache to the disk.
3. Turn OFF all power to the disk array.
4. Remove the controller enclosure from the cabinet.
5. Disassemble the chassis to access the harnesses.
Controller Enclosure Troubleshooting
273