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xen-devel
Re: [Xen-devel] Does XEN have any hot backup/snapshot features or plan?
Hot snapshot capabilities are in blktap2 (in xen-unstable) for qcow and
vhd. However, there's no unified snapshot interface. Each driver has its
own interface, but you could script something up for one or more disk
types pretty easily. Check out tools/blktap2/vhd/vhd-util.
--Dutch
On Sun, 14 Jun 2009, Omar BENHAMID wrote:
Hi,
I was thinking of prototyping "hot snapshotting" of blktap backed vbds.
The idea would be for example : for a domain called MyDomain having
/var/xen/data/mydisk.vmdk attached to hda
xm vbd-snapshot-create MyDomain hda /var/xen/snapshot/snapshot1.vmdk
xend will then synchronise the domain, pause it and signal blktap daemon to
create a disk snapshot : Current block device attached to hda would be
closed and moved to /var/backup/snapshot1.vmdk than recreate mydisk.vmdk as
a cow copy of snapshot1.vmdk then unpause the domain. snapshot1.vmdk could
be backed up safely as it receives no writes. After backup imagine some
thing like :
xm vbd-snapshot-merge MyDomain hda
That would "commit" mydisk.vmdk into snapshot1.vmdk, either with a paused
domain or (more complex but more confortable) live.
- How interesting this would be for general use ? Interface should of course
be generic enought to support large variety of tap storage backends (cow,
vmdk, vhd ?). Would it be interesting enought to some day get integrated in
mainstream xen ? Or philosophy of lean means that we won't implement in xen
something that LVM would do fine ?
- Is there already some work like this ?
- As of xen 3.2 (and hopefully 3.3) i think blktap daemon is the right place
to do it, adding the right callbacks to tap_disk structure and implementing
it in convinent drivers. But i saw plans with xen 3.4 (or after ?) with the
idea of deep rework trying to merge everything in qemu device model? What is
the best place to do this ?
Regards,
Omar BENHAMID
On Mon, Apr 6, 2009 at 1:47 AM, zign <zign@xxxxxxxxxxxxxxxx> wrote:
Hello everybody,
My name is Zign and I would like to ask a simple question.
For example, I want to backup my VMs everyday. But I do not
want them to be stopped while the backup. For this reason, I can't
use a traditional way like: freeze the VM -> backup everything ->
restore the VM.
So is there any solution for this?
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Zhao Yue
Esaki Laboratory,
Information Physics & Communication Engineering,
Graduate School of Information Science and Technology,
The University of Tokyo
Email: zign@xxxxxxxxxxxxxxxx
zign@xxxxxxx
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http://lists.xensource.com/xen-devel
--
Omar BENHAMID
Email: o.benhamid@xxxxxxxxx
Tel: +33 6 09 31 60 60
http://www.bewigo.fr
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