Dell Precision T7400 (Late 2007) - Manual (Page 49)

Advanced Features 49
Replacing and Rebuilding a Degraded RAID Volume
In the event of a hard drive failure in a RAID level 1 volume, you will need to
replace the hard drive and resynchronize the RAID volume.
1 Replace the failed drive with a new drive of the same type and capacity (or
larger capacity).
2 Check your management application or the RAID Configuration Utility
(Ctrl-C) to ensure synchronization started automatically.
NOTE: Proceed to step 3 only if synchronization does not begin automatically.
3 Enter the RAID Configuration Utility (Ctrl-C).
4 From the Adapter List screen, select the controller that contains the
degraded RAID volume.
5 From the Adapter Properties screen, select RAID Properties.
6 Press until the degraded RAID level 1 volume is in view, then
select Manage Virtual Disk.
The screen shows the RAID volume with a status of “Degraded”.
7 Select Add Secondary Disk and select a drive from the list of available
drives.
The new hard drive automatically begins to sync with the drive of the
degraded RAID level 1 volume.