[sheepdog] Live snapshot not working via libvirt. Possible regression?
mitake.hitoshi at gmail.com
Fri Sep 11 05:52:19 CEST 2015
On Fri, Sep 11, 2015 at 12:20 AM, Jason Noble <noblej at yahoo.com> wrote:
> My understanding from the page at
> is that sheepdog can store qemu checkpoints internally using the 'raw'
> format. I am having problems when trying to take a live snapshot of a VM
> stored on sheepdog though. I get the following error message when using
> `virsh snapshot-create --live domain`:
> "internal snapshot for disk vda unsupported for storage type raw"
> This behavior appears to have been introduced with the following commit:
> commit f7c1410b0ee5b878e81f2eddf86c609947a9b27c
> Author: Shanzhi Yu <shyu at redhat.com>
> Date: Sat Feb 28 17:51:36 2015 +0800
> qemu: snapshot: Don't skip check for qcow2 format with network disks
> When the domain's source disk type is network, if source protocol is rbd
> or sheepdog, the 'if().. break' will end the current case, which lead to
> miss check the driver type is raw or qcow2. Libvirt will allow to create
> internal snapshot for a running domain with raw format disk which based
> on rbd storage.
> While both protocols support internal snapshots of the disk qemu is not
> able to use it as it requires some place to store the memory image. The
> check if the disk is backed by a qcow2 image needs to be executed
> I reverted the above commit, built libvirt and tried again and got the
> following error:
> "error: Operation not supported: live snapshot creation is supported only
> with external checkpoints"
> Before digging any further into this issue, I wanted to ask on the mailing
> list if this behavior seems incorrect to others. If this behavior _is_
> expected then I think the wiki page linked in the opening of this email
> should be updated to reflect that.
Thanks for your report. However, I'm not sure about this is a problem
or not because I'm not using libvirt :(
Vasiliy, how do you think about it?
> The versions of qemu, libvirt and sheepdog I'm using are listed below.
> jason at sheepdog1:~/sheepdog$ qemu-system-x86_64 --version
> QEMU emulator version 2.3.0 (Debian 2.3+dfsg-0ubuntu1), Copyright (c)
> 2003-2008 Fabrice Bellard
> jason at sheepdog1:~/sheepdog$ libvirtd --version
> libvirtd (libvirt) 1.2.16
> jason at sheepdog1:~/sheepdog$ sheep -v
> Sheepdog daemon version 0.9.0_165_g01fe35e
> sheepdog mailing list
> sheepdog at lists.wpkg.org
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