Hardware options installation 78
o Install the server in the rack.
24. Connect any external cables to the PCI-X expansion boards.
25. Power up the server (on page 24).
Battery-backed write cache option
The server supports multiple memory modules and RAID levels:
• 256 MB supports RAID 0, 1, 10
• 512 MB supports RAID 0, 1, 5, and 10
CAUTION: To prevent a server malfunction or damage to the equipment, do not add or remove
the battery pack while an array capacity expansion, RAID level migration, or stripe size migration
is in progress.
IMPORTANT: The battery pack might have a low charge when installed. In this case, a POST
error message is displayed when the server is powered up, indicating that the battery pack is
temporarily disabled. No action is necessary on your part. The internal circuitry automatically
recharges the batteries and enables the battery pack. This process might take up to four hours.
During this time, the cache module functions properly, but without the performance advantage of
the battery pack.
NOTE: The data protection and the time limit also apply if a power outage occurs. When power
is restored to the system, an initialization process writes the preserved data to the hard drives.
To install the component:
1. Power down the server (on page 24).
2. Do one of the following:
o Open or remove the tower bezel, as needed ("Open or remove the tower bezel" on page 25).
o Extend the server from the rack (on page 24).
3. Remove the access panel (on page 26).
4. Locate the cache module connector ("System board components" on page 11).
5. Open the cache module latches.
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