Installation guide

Maintenance Processes
Manual No. 771961 6-3
Running a Device Rebuild
If a single device in a fault tolerant system fails, the system is spared data
loss by virtue of the striping with parity present across the logical drive
(RAID 3, RAID 5) or the total redundancy of data (RAID 1, RAID 0+1). The
failed drive needs to be replaced, and the failed drive’s data must be rebuilt
on a new drive to restore the system to fault tolerance once again.
The device rebuild function performs this task. A failed drive’s data can be
rebuilt to:
• The original drive if this drive happens to be still functional
• A hot spare (standby) drive present for just this purpose, or
• A drive inserted in place of the failed drive.
If you need to carry out a device rebuild, perform the following procedure:
1. Reinsert the removed drive that caused the failure (if it is still a good
drive), or replace the failed drive with a new drive of equal or greater
capacity.
2. Double-click the relevant physical device in the Controller View
window.
The Disk Device Information dialog box will open, and the Rebuild
button should be available (Figure 6-2):
Figure 6-2. Rebuild Button Available for This Disk Device