Acer Altos R520 Manual Do Utilizador

 3 System upgrade

82

Installing and removing the SAS 
hardware RAID components

The system supports SAS hardware RAID through the active mid-plane 
and backplane board. The server platform supports SAS hardware RAID 
0, 1, 5, 6 (when available), 10, and 50 levels. Functionality for SAS 
hardware RAID is enabled by using the following components:

•

RAID activation key  and RAID cache

The RAID activation key works in conjunction with the RAID cache 
to provide hardware RAID.

•

RAID BBU

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. 

Installing and removing the RAID activation key 
and RAID cache

To install the RAID activation key and RAID cache:

1

Observe the ESD precautions and pre-installation instructions 
described on page 39.

2

Remove the power distribution board cover. Perform the 
instructions described in “To remove a power distribution module 
cover” section on page 48.

3

Remove the RAID activation key from its protective packaging. 

4

Align then insert the activation key into the RAID activation key 
connector on the active mid-plane board (A).

5

Locate the RAID cache memory (DDR-2) slot on the active 
mid-plane board.