RAID 1: breaking mirrors and rebuilding drives, 4th Edition

Figure 2. Boot-up message indicating the controller found no logical drives.

6. During boot-up, the message will indicate that the drives are not responding (Figure 1).

7. Press F2 to fail the missing drive and continue with one drive in recovery mode.

8. Insert the drive you want to rebuild into the open drive bay.

9. The array rebuild should start automatically. If the rebuild does not start, run ACU to initiate the

rebuild.

CAUTION

You must hot insert the drives you want to rebuild. This ensures

that the array controller recognizes the drives as replacements.

Installing drives while the server is off may result in the controller

disabling the volume.

NOTE

The drive-online LED will blink during the rebuild process. The

rebuild is complete when the LED stops blinking and turns solid

green. A 300-GB SAS (3.5” 15K) drive can take up to 2 hours

to rebuild a mirrored (depending on the number of IOPS the

server is submitting to the controller).

10. Boot the OS after the rebuild completes. This ensures fault-tolerance with the logical drive.

Increasing RAID 1(+0) capacity—array expansion versus

breaking mirrors

You can also increase the capacity of a RAID 1(+0) array by using the Expand Array and Logical

Drive Extension functions in ACU. This requires you to add pairs of physical drives to the existing