[Libvir] Concepts in storage management

[Daniel P. Berrange]

On Tue, Oct 16, 2007 at 04:19:29PM +0100, Daniel P. Berrange wrote:
> Application users
> =================
> 
>  - virt-manager / virt-install
>     - Enumerate available pools
>     - Allocate volume from pool
>     - Create guest with volume

When we support migration the storage API should let us do sanity
checking prior to migration. The metadata provided for a poool and
a volume should allow an algorithm sort of like this

     For each disk assigned to the guest
       - Lookup volume associated with the path on the source host
       - Lookup volume associated with the path on the dest host
       - If the dest volume is missing, refuse to migrate
       - If the dest volume has as different UUID refuse to migrate
         (Sync UUID to SCSI worldwide name perhaps ?)

       - Lookup pool associated with the volume on source host
       - Lookup pool associated with the volume on dest host
       - If the pool is different, then refuse to migrate (catches
         case of a different NFS mount being used, or it being a
         local internal storage pool, for example)

Dan.
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