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PowerEdge T110 - Replaced failed drive in RAID10. How to get RAID 10 configuration back to normal operation?
It is using a PERC S100 controller.
There is one Virtual Disk. Configured as RAID 10. State is degraded.
Before replacing the drive:
There were 3 hard drives visible. Split between Span 0 and Span 1.
In Span 0, the drives visible were 0:0 and 0:1.
In Span 1: the drive visible were 0:3.
This meant drive 0:2 had failed and so I replaced it. However, after replacing it; the new drive was placed into it's own RAID 0 by the controller.
I removed that RAID 0 and tried adding the new drive to the RAID10 but the only option I saw available was 'Assign Dedicated Hot Spare'. I selected this and the Virtual Disk started 'rebuilding'.
But now when I go into the Virtual Disk details I see:
In Span 0, the drives visible are 0:0 ,0:1 and 0:2.
0:0 is in a 'Ready' State. 0:1 and 0:2 are 'Online'.
In Span 1: the drive visible is still only 0:3.
The way I interpret is that now it is rebuilding Span 0 with drives 0:1 and 0:2 but not including 0:0...is that correct?
How would I add a drive back into Span1?
DELL-Chris H
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November 27th, 2017 11:00
ToTheMoon,
Are you booting to Windows after this to see if it will rebuild to the Span? I ask as the rebuild process occurs in Windows and not in the CTRL + R configuration utility. So the controller BIOS won't show a change until you boot to the OS.
Let me know and we can go from there.
Tothemoon
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November 27th, 2017 11:00
The server is already booted into Windows and I am checking the status in OMSA. These screenshots show what I'm seeing there. I had expected that as soon as the rebuild started it would place the new disk (0:2) into Span1 but instead the controller has placed into Span0 and changed the status of one of the existing disks (0:0) to 'Ready'.
Mtexter
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November 27th, 2017 12:00
Beware of 0:3 too, it looks like it's in a predicted failure state. After that first rebuild completes, and if it looks like it is supposed to at that point, be sure to replace 0:3 ASAP
DELL-Chris H
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November 27th, 2017 12:00
Thank you. The process you specified looks to be correct, but the screenshot also shows that the Span is currently in a rebuilding state at 57%. It may be that OMSA isn't accurately reflecting the status until the rebuild is complete. One thing you can also do to test this is wait till the rebuild hits 100% and then restart the OpenManage services to have it retrieve the storage information after the rebuild completes. Then see if the drives are shown correctly in both OMSA and the controller BIOS as well.
The services to restart are listed below;
Server Administrator Instrumentation Service
DSM SA Data Manager
DSM SA Event Manager
Server Administrator
DSM SA Connection Service
DSM SA Shared Services
Tothemoon
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November 28th, 2017 06:00
Update: I assigned as global hot spare and yes 0:0 is now rebuilding itself in Span1...not sure why this wouldn't have worked when assigning a disk as dedicated hot spare. From what I understand, that should not make a difference in this case.
Shouldn't Global vs Dedicated only matter if there is more than one Virtual Disk on the server? This server has only one Virtual Disk.
Tothemoon
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November 28th, 2017 06:00
The rebuild is done and the result is not what I wanted but it is what I expected to happen....
Instead of placing the new disk 0:2 into Span1 where its needed, the controller placed into Span0.
And removed 0:0 from Span0 so it is now an available disk...what is my next option here. Would assigning 0:0 as a global hot spare assign it Span1?
Tothemoon
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December 1st, 2017 05:00
Another update: Rebuild finished successfully. Virtual Disk showing in optimal state because both spans are back to being redundant.
Of course, that degraded disk is still there. Will replace that next.
End result is that 'Global Hot Spare' needs to be selected so the disk will rebuild in the correct span.
Would be nice if Dell clarified why that is since there should not be any difference in this case.