libvirt users - Nov 2012 - move VM disk images between storage pools on the same host

I created a new LVM type storage pool on my server and would like to move my 
VM disk volumes in a directory-based pool into this new pool.  But I cannot 
figure out how that is done.  I find plenty of information on how to migrate 
live VM images from one host to another, but not on how to just move one live 
from one storage pool to another on the same host.

If it cannot be done live, how an I do it non-live?  I guess non-live I could 
clone, but that would change the MAC address.  Just seems that if libvirt
can migrate live it should be able to move a VM between storage pools
on the same host even easier.

---------------------------------------------------------------
Paul Raines                     http://help.nmr.mgh.harvard.edu
MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
149 (2301) 13th Street     Charlestown, MA 02129	    USA





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On 11/07/2012 02:13 PM, Paul Raines wrote:
> 
> I created a new LVM type storage pool on my server and would like to
> move my VM disk volumes in a directory-based pool into this new pool. 
> But I cannot figure out how that is done.  I find plenty of information
> on how to migrate live VM images from one host to another, but not on
> how to just move one live from one storage pool to another on the same
> host.
> 
> If it cannot be done live, how an I do it non-live?  I guess non-live I
> could clone, but that would change the MAC address.  Just seems that if
> libvirt
> can migrate live it should be able to move a VM between storage pools
> on the same host even easier.
Hmm - you have a good point - right now, 'virsh vol-create-from' and
'virsh vol-clone' only allow motion within a single pool, and not from
one pool to another.  I guess you could use 'virsh vol-download' and
'virsh vol-upload' to move volumes from one place to another, although
those APIs still lack the ability to cleanly state whether you are
migrating metadata (what the host sees) or contents for conversion into
a different format (what the guest sees).  At any rate, these commands
would be useful on offline disks (and NOT for a disk image in active
read-write use by any qemu guest).  I think there's a lot of work that
could be done to improve matters with how we manage volumes and pools.

Meanwhile, live storage migration IS possible, with libvirt 1.0.0 (now
out) and qemu 1.3 (which will be released in December, or if you are
comfortable building from qemu.git now), via the 'virsh blockcopy'
command.
> The information in this e-mail is intended only for the person to whom
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-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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