Thanks, it looks like it is a 3 drive raid 5, currently on drives 1,2 and 3. Drive 0 is not doing anything. The controller has the warning for the firmware being out of date. [URL]
I recently had a 600GB 15K SAS drive go into predictive fail in a 4-drive RAID 5 array.  The server has the latest supported build of OMSA on the system, but the web interface is not working, so I am working with the command line, which I am much less familiar with.  I pulled the predictive-fail drive from the system and replaced it with a refurbished drive.  The drive is being recognized properly, but it was not added to the array.  Instead it appears to be treated as a stand-alone drive.  The pred-fail drive was 0:0:1, but for some reason 0:0:0 went into rebuild, not 0:0:1.  The rebuild completed, but the array is still showing only the 3 drives and shows a status of "degraded". My first though is to flag the new drive as a hot-spare (it is not seen as such) and hope it grabs it for the rebuild, or reboot the server and hope that corrects the issue, though that seems less likely to correct the issue, and more risky.  Has anyone else seen this?  Any suggestions would be appreciated!
Replacement SAS HDD Not Rebuilding (T310 Perc H700 RAID5)