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 was 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?