Re: [libvirt-users] how to store an internal disk snapshot by use
On 05/29/2012 03:40 AM, Rujie Xu wrote:
Hello everyone,
I am trying to find a way to store an internal disk snapshot and
supposed to restore later.
Here is the problems I met:
1) when I use SnapshotCreateXML() to create a disk_only snapshot while
the domain is inactive, there is an error happened:
disk snapshot of inactive domains not implemented yet.
I am wondering is there and way I can save the disk_only snapshot when
the domain is inactive right now?
That code still has to be written. It's on my todo list.
https://bugzilla.redhat.com/show_bug.cgi?id=817226
That said, if you _don't_ use the disk_only flag and the domain is
offline, then the end result right now is that you get internal
snapshots for free (since a system checkpoint of an offline domain _is_
the disk snapshot, and since system checkpoint currently uses internal
snapshots only).
2) also use snapshotCreateXML() to create a disk_only snapshot while
the domain is active, and use the xml to set the <disk name="hda"
snapshot="internal"> there is also an error happened:
unsupported configuration: active qemu domains require external disk
snapshot; disk hda requested internal
Correct. Qemu does not support the creation of internal disk snapshots
except by the 'savevm' command which takes a system checkpoint snapshot
(that is, unless qemu gives us a way to do disk-only internal snapshots
of a running VM, you are stuck on this front).
3) when I use snapshotCreateXML() to create a disk_only snapshot using
external file, it could be done, but when I try to use revertToSnapshot()
to revert this snapshot there is another error happened:
revert to external snapshot not supported yet.
Correct, that's another API that I haven't yet coded; and you're the
second person to ask about it this week:
https://www.redhat.com/archives/libvirt-users/2012-May/msg00122.html
Is there anyone can help me about this, or we just can't use libvirt to
managed the disk snapshot right now?
Help in contributing code would be very welcome.
--
Eric Blake eblake(a)redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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