[libvirt-users] how to store an internal disk snapshot by use
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? 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 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. Is there anyone can help me about this, or we just can't use libvirt to managed the disk snapshot right now? Thanks very much! -- Best Regards, Roger Xu
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@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
as far as i kown ,we can use qemu-img command to do disk-only snapshot while the vm is shut off 2012/5/29 Eric Blake <eblake@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 eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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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 <eblake@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 eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
-- Regards, Roger Xu
participants (3)
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Eric Blake -
Rujie Xu -
xingxing gao