Re: [Qemu-devel] [Snapshot Mode]

[edison]

savevm will take disk snapshot also, then you can copy the snapshot
out of disk image to another storage.
I had posted two patches about it:
http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01662.html
and http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg00655.html.
FYI.
BTW, if you just want to try taking online snapshot or bakcup snapshot
on QCOW2, our CloudStack may fit your requirement
(http://git.cloud.com/cloudstack-oss)

On Thu, Sep 23, 2010 at 1:31 PM, Benjamin Kormann <address@hidden> wrote:
> Hi there,
>
> we've been using qemu for quite a while on different platforms and we'd like
> to perform snapshots on running qemu machines and tar them onto a backup
> server.
> The qemu-img snapshot can only be applied to inactive qemu machines
> (images), hence this is not applicable. The savevm command within the qemu
> monitor saves the current cpu state, ram, device state and content of all
> writable disks. After this command has ended the qemu machine is still
> running and a backup (copy or tar of file) can potentially be initiated.
> Since the machine is still up and running changes occur to the qemu image
> and the final backup file might become corrupted if no snapshot
> functionality is supported by the underlying filesystem.
> Finally my question is:
> How can I perform a backup of a system at runtime (at best without the need
> of any filesystem snapshot)?
>
> Thank you very much in advance.
>
> Cheers,
>
>
>        - Benny
>
>
>
>