Rhyds, Are the drives you have hot swappable? If so you can simply remove the drive while the server is running and then wait about 30 seconds and then insert the replacement and it should automatically start rebuilding. If the drive is cabled then you can access the controller bios (CTRL-A on boot) and then force that drive offline, then power down and replace drive.  Then you can access the controller bios again and set it to rebuild, or hot spare, as that will cause a rebuild as well.  Let me know how it goes.
What is the correct procedure regarding swapping out a failing (but not yet failed) disk on a CERC 1.5/2s array? My server has a brand new disk that is slowly failing (clicking noises coinciding with the OS hanging, once the clicking stops it works again) on a CERC SATA 1.5/2s array. It is running at the moment but I wish to swap it for an identical replacement. Am I correct in thinking that the correct procedure is: 1: Identify faulty drive 2:Power down server, remove faulty drive 3: Boot server to OS to force RAID array in to "degraded" state 4: Power down server, fit new drive 5: Boot server and use either CERC BIOS or RAID Storage manager to set new disk as hot-spare 6: Allow array to rebuild  Is this a suitable procedure?
Replacing failing disk in Poweredge SC1420 / CERC SATA 1.5/2s RAID1 array