Acer R910 Series ユーザーズマニュアル

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Configuring integrated SCSI hardware 
RAID components
The system supports hardware RAID through the storage I/O processor 
in conjunction with the LSI SCSI controller. The server platform 
supports RAID 0, 1, 5, and 10 configurations. Functionality for 
hardware RAID is enabled by using the following components:
RAID activation key (iButton)
RAID cache
There is also an option to install the RAID BBU (battery backup unit). If 
power to the storage I/O processor 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.