HP Store Once 4900 Backup Maintenance and Service Guide

6 RAID cache module and SuperCapacitor failures
Spares part numbers
NOTE: Never move cache modules from one RAID controller to another within or between systems.
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 replacement procedures and
spares part numbers. The HP StoreOnce 4900 Backup has two cache modules with SuperCapacitor,
one for each RAID card in PCIe slot 1 and PCIe slot 4.
Identifying the cache module or SuperCapacitor failure
If the SuperCapacitor is disconnected on the first RAID card in the HP 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.
In the following example the SuperCapacitor module has been disconnected from or failed on the
second RAID card.
Example alerts
Subject: HP StoreOnce 4900 Backup hardwarecomponent.failure event
The following event occurred: hardwarecomponent.failure
Severity: ALERT
Date: Wed Jan 28 14:17:11 UTC 2014
Appliance: HPCZ225101H9
20 RAID cache module and SuperCapacitor failures