It should just automatically rebuild itself into the RAID 1, nothing special you have to do.
I recently replaced a disk on our old lab 1900 and it reuilt on its own just fine.
Thank you for the confirmation. Still waiting for Dell to confirm if they have disk available otherwise, Amazon, here I am...
Tried to hot replace the failed drive yesterday night and the 2 disks we bought didn't work. Either the disks (refurbished) are bad or the auto rebuild is not working. Did you shutdown the server before replacing the failed drive or just hot replace it? Any suggestion?