ok, I see, thank you very much for your kindly reply, the answer is very clear and useful for me. Thanks a lot!
2012/5/29 Eric Blake <ebl...@redhat.com> > 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 ebl...@redhat.com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > > -- Regards, Roger Xu
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