The pertinent information to figure out scenarios for volume rebuilding after a drive replacement on QX/QXS-DotHill arrays can found on these pages:

 

                page 17 of the current QX-Series Service Guide, covers "Reconstructing a vdisk"

                page 7 of the current Disk Management Utility Users Guide, covers "About spares"

 

What it boils down to is that a vdisk in a Dot Hill array, that is in a degraded state, will look for a disk to rebuild on in the following order:

          1st - the replaced disk, if the Dynamic Spares option is set

          2nd - if a Dynamic Spare is not available, then a disk that is configured as a dedicated spare to that vdisk is used

          3rd - if a Dedicated Spare is not available, the vdisk will look for a Global Spare

 

DotHill gives so many options that it is more confusing than convenient, to a beginner with their arrays.

Maneuvering around in the Management GUI to set these options up can be just as confusing.

To try and simplify that, reference the steps below:

 

(Dynamic Spares)

From the top level of the "Configuration View" in the left hand window select from the drop down menus:

 Configuration --> Advanced Settings --> Disk | option "Dynamic Spare Capability" --> click Apply

 

(Dedicated Spares)

On the selected Vdisk in the "Configuration View" in the left hand window select from the drop down menus:

  Configuration --> Manage Dedicated Spares | check mark any 'AVAIL'able disks and click the Modify Spares button

 

(Global Spares)

From the top level of the "Configuration View" in the left hand window select from the drop down menus:

  Provisioning --> Manage Global Spares | check mark any 'AVAIL'able disks and click the Modify Spares button