Redundant RAID 5 Array did not rebuild when failed drive replaced

Posted on 2012-08-31
Last Modified: 2012-08-31
I have a Dell PowerEdge 2950 server running Windows Server 2003.  Virtual Disk 0 was showing up as "degraded", and physical drive 0:0:0 was "foreign".  In the BIOS, Drive 0 was listed as "missing" and "failed".  I replaced the drive this morning, but the virtual disk did not rebuild automatically.  Now OpenManage software lists the three physical drives as:

                               State              Used RAID Disk Space         Available RAID Disk Space
Physical Disk 0:0:0  Ready                     0.0   GB                                           232.38 GB
Physical Disk 0:0:1  Online               232.25 GB                                                  0.0 GB
Physical Disk 0:0:2  Online               232.25 GB                                                  0.0 GB

Under the Virtual Disk properties, it only lists physical disks 0:0:1 and 0:0:2 in the virtual disk.  

Is it possible to add the new disk to the existing virtual disk?  Shouldn't it have rebuilt automatically when I installed the new drive?

Question by:CelticHeart3
    LVL 32

    Accepted Solution

    Many things can prevent an automatic rebuild.  Assuming you have a PERC 5/6, you need to assign the new disk as a hot-spare ... OMSA, Storage, PERC, Virtual Disks, and Assign Hot-Spare from dropdown menu for your RAID 5.
    LVL 13

    Expert Comment

    by:Norm Dickinson
    If you have critical information on that array it may be time to call tech support or a data recovery lab to help you get through this, as doing it wrong can overwrite your data. If you have a backup, there are many things you can try, including rebuilding the virtual disk manually.

    Author Comment

    Thanks PowerEdgeTech.  But assigning it as a hot-spare doesn't add its disk space to the array... does it?
    LVL 32

    Expert Comment

    You don't want to add its disk space to the array, right?  Aren't you rebuilding a failed drive?  The PERC 5/6 does not have a "rebuild" option, so the only way to start a rebuild manually is to set the drive as a hot-spare and allow it to rebuild in the place of any absent disk.

    Author Comment

    Thanks for the help!  If I add the new disk as a hot-spare, am I right in assuming that my drive capacity will remain as it is now, but the "degraded" tag will go away... and if one of the existing two drives in the array fails, it will automatically build on the hot spare?

    Author Comment

    That's exactly what I needed to know, PowerEdgeTech.  Thank you!

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