1 of 2 (RAID 1) hard drives in my system failed and a new hard drive has been installed. How do I get the disks re-mirrored with Red Hat Enterprise Linux 3?

The raidhotadd command will rebuild your RAID array once the drive has been replaced.

Before running raidhotadd, you need to determine the layout of your RAID array. You can view this by looking at the /etc/raidtab file, for example:

# cat /etc/raidtab

       raiddev /dev/md0
           raid-level              1
           nr-raid-d...