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

Reverting to a previous copy of a mirrored set using the

manual method

This method works only if you used the manual method to break the mirrored set.

CAUTION

We strongly recommend that you verify that you have removed

all drives from the current array before inserting the backup

drives (step 1 below). Any drive that became part of the array

during a rebuild process can OVERWRITE the BACKUP drive.

Be especially careful in using hot spares, where the rebuild may

have happened automatically and it is unclear whether another

drive is now part of the array. To simplify this process, remove

any spares before breaking the mirror and reinstall the spares

only after the array rebuilds.

Complete the following steps to revert to a previous copy of a mirrored set:

1. Power off the server.

2. Remove all drives from the array and insert the drives containing the backup data (the original

image on the array).

3. Install the backup drives in their original locations. If you are not sure where the backup drive

came from, insert the drive into one of the drive bays where you created the array. You may need

to move the drive if the controller does not detect a logical drive during boot-up.

4. Restart the server with only the backup drives installed.

5. If the controller finds no logical drives during boot up (Figure 2), you probably placed the drive in

the wrong drive bay. Turn off the server, remove the drive, and place it into another available

drive bay. Then power on the server.