I haven't been able to test this on my hardware yet, but as I understand
this should be possible:
I have a computer with several physical partitions: (say /dev/sda1.
/dev/sdb1, /dev/sdb2).
I build a PV which boots from a file-based disk image somewhere in the
/dev/sdb1 partition (/usr1/xen_vm_images/disk0).
>From that PV I can mount one of the real physical partitions (/dev/sdb2)
and read/write to it. I can also export it via NFS.
>From the dom0 I can ALSO mount /dev/sdb2 (being careful not to write to
it).
I want to do this so that I can backup up the data in /dev/sdb2 from the
dom0 to a totally different machine without using time/resources on the
PV.
On the second backup machine, I also have a /dev/sdb2 partition, which
receives the backups. I also periodically, manually copy the disk image
of the PV to the backup machine (because I cannot run Remus on SuSE
10.1).
I want to be able to stop the PV on the primary, and start it up on the
backup machine.
Does this make sense? Note that the /dev/sdb2 partition may be very
large, several terabytes, but the PV disk image is smaller, maybe 80GB.
Thank you in advance for any direction.
-k
Kenn Lippert
Computation & Simulation Modeling, 
Product Manufacturing Division
Alcoa Technical Center.
Tel: 724-337-2691
Email: kenneth.lippert@xxxxxxxxx
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