[libvirt-users] virsh snapshot-create and blockcopy

[Thomas Stein]

Am 10.06.13 09:07, schrieb Kashyap Chamarthy:
> On 06/09/2013 02:46 PM, Thomas Stein wrote:
>> Hello.
>> 
>> I just tried the following:
>> 
>> virsh dumpxml --security-info gentoo-template > gentoo-template.xml
>> virsh snapshot-create gentoo-template
>> virsh undefine gentoo-template
> 
> Wait - is that really the command you used after "snapshot-create" ?

> Because: You cannot undefine a guest with a snapshot without first deleting its metadata
> 
> To cleanly delete, maybe you should've done:
> 
>   $ virsh snapshot-delete --domain gentoo-template SNAPSHOTID --metadata

Did that. But that deletes that snapshot too, no?

> 
>> virsh blockcopy gentoo-template vda
>> /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2 --wait --verbose --finish
>> virsh define gentoo-template.xml
> 
> Can you also paste the output of:
> 
>   $ qemu-img info --backing-chain \
>   /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2

hn ~ # qemu-img info --backing-chain
/opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2
image: /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2
file format: qcow2
virtual size: 130G (139586437120 bytes)
disk size: 30G
cluster_size: 65536

Just to make myself clear. I want to backup the qcow image /with/ the
internal snapshot. Is that even possible with blockcopy?

thanks and best regards.

>> virsh snapshot-delete gentoo-template --current
>> 
>> But if i restore the /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2 the
>> snapshot is gone.
>> 
>> Someone has an idea what i'm missing? I suppose i'm just missunderstandig the snapshot
>> mechanism.
> 
> Here's how I used blockcopy (few months ago, slightly outdated) --
> http://kashyapc.fedorapeople.org/virt/lc-2012/live-backup-with-blockcopy.txt
> 
> 
>> 
>> thanks an best regards
>> t.
>> 
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> 
>