Acer Altos R910 Series User Manual page 107

Note: RAID activation key and RAID cache is required to activate
integrated SAS hardware RAID. For instructions on installing RAID
activation key on the server RAID adapter, see page 95.
6 Observe the post-installation instructions described on page 38.
RAID BBU
If power to the server RAID adapter drops below specifications, the
RAID BBU maintains the contents of the DIMM by keeping the DIMM
in self-refresh mode until power is restored. After power is restored,
data can be safely written to drives, maintaining the integrity of the
disk array.
Removing the RAID BBU
1 Observe the ESD precautions and pre-installation instructions
described on page 37.
2 If a memory board is installed in memory board slot D, remove the
board. For instructions on removing a memory board, see page 75.
97