[libvirt] bug: try to take disk snapshot for LVM2 Volume

[MATSUDA, Daiki]

Hi, Eric.

> On 09/29/2011 11:26 PM, MATSUDA, Daiki wrote:
>> I tried the new snapshot function implemented by Eric Blake.
>>
>> It works very well for QCOW2 disk image system.
>> But I often use LVM2 volume for QEMU virtual machines and tried to take
>> disk snapshot by virsh command ( snapshot-create DOMNAME --disk-only).
>> So, finally qemu monitor command 'snapshot_blkdev' accepts the LVM2
>> volume and create QCOW2 snapshot image. In addition, domain's
>> configuration file is replaced to use snapshot disk image instead of
>> LVM2 volume.
> 
> It sounds like virsh did what it was told, but that you told it so
> little information that it had to fill in the gaps and choose its own
> destination file name (hence the .1317357844 suffix after the action).
> Your situation sounds like a case where you may want a bit more control
> over the destination file name.

I made the patch for the problem to take the snapshot but qcow2. It use
the 'qemu-img' command, I know that it is not essential solution. But I
think it is better than to link qemu's libraries.

Regards
MATSUDA Daiki

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