2 Replies Latest reply on Nov 30, 2010 11:18 PM by RockChalk

    Raid 1 Missing Hard Drive ??


      Had a Raid 1 drive fail. Replaced it with new same. Hit CTRL-I during reboot to enter config util and followed the prompts to add the new drive and initiate the auto re-build. Ok. Seems straightforward. Boot to Vista 64 and the rebuild begins. Enter IMSC and it shows the array rebuilding but it also shows that now it contains 3 drives and one of those drives is missing!!! Huh? How did that happen? More importantly, how do I correct it without it crashing the array?

        • 1. Re: Raid 1 Missing Hard Drive ??

          Strangely, after completing the rebuild the array as reported in IMSC appears to be normal and back down to just two drives. Peculiar.

          • 2. Re: Raid 1 Missing Hard Drive ??

            It may seem strange, but what you saw was the expected behavior.  You started out with 2 drives in a RAID1 configuration.  Let's call them drives A and B.  Then Drive B failed.   You removed Drive B, and inserted Drive C, and flagged it for a rebuild.  When you removed drive B, you effectively had a RAID 1 volume with a missing disk that was rebuilding to a new disk C.  The RAID controller will not "forget" about drive B until it has fully rebuilt to drive C.  Only once drive C is fully operational will the RAID controller consider drive B to be replaced.