HP StoreOnce 4900 - RAID Cache Module and SuperCapacitor Failures; About the SuperCapacitor and RAID Cache Module; Replacing the RAID Cache Module and SuperCapacitor

6 RAID cache module and SuperCapacitor failures
About the SuperCapacitor and RAID cache module
The RAID cache module is slotted onto the RAID card; the SuperCapacitor is located in the
center of the unit, clipped to the floor of the chassis behind the disk cage. These items ensure
cache contents are maintained after a loss of power.
The HPE StoreOnce 4900 Backup has two cache modules with SuperCapacitor, one for each
RAID card in PCIe slot 1 and PCIe slot 4.
NOTE: Never move cache modules from one RAID controller to another within or between
systems.
If the SuperCapacitor is disconnected on the first RAID card in the HPE StoreOnce 4900 Backup,
the system will not boot. If boot fails, it is a good idea to check that the SuperCapacitor is seated
correctly.
If the SuperCapacitor or cache module has failed, the system may still boot with error messages
and it will run more slowly.
The replacement spares part numbers are:
• SuperCapacitor, spares part number 660093–001
• RAID cache, spares part number 633542–001
If replacing this module does not resolve the problem, it may be necessary to replace the RAID
controller card. See the previous chapter for more information about RAID card replacement
procedures and spares part numbers.
Replacing the RAID cache module and SuperCapacitor
NOTE: The recommendation is to replace both the SuperCapacitor and RAID cache module
at the same time, regardless of which element has failed.
1. Remove the cover from the HPE StoreOnce Backup system, as described in the appropriate
HPE ProLiant Maintenance and Service guide, and locate the module.
2. Look at the LEDs on the module. If the LEDs are blinking amber the module should be
replaced. If they are flashing amber and green, the module is disconnected.
3. If the module is disconnected, reseat it on the HP p1228 RAID card. If it is damaged, remove
it, dispose of the old module and replace it with the new one. Check that the cable is
connected correctly to the SuperCapacitor..
About the SuperCapacitor and RAID cache module 23