Creating external snapshots with logical volumes.

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Hi,

Quick question regarding external snapshots.

Currently, for making backups of my guests, I use external snapshots like this:
virsh snapshot-create-as --domain PCVIRTdra --disk-only --atomic --quiesce --no-metadata --diskspec vda,file=/srv/poolVMS/PCVIRTdra-ONDERHOUD

If I wanted to use a logical volume as destination behind the '--diskspec' option, can I do this like this?
virsh snapshot-create-as --domain PCVIRTdra --disk-only --atomic --quiesce --no-metadata --diskspec vda,file=/dev/CmsrvVH3-vg/PCVIRTdra-ONDERHOUD

It seems to work, but if this is never intended to be used like this, I would rather not...

I ask this question because it seems libvirt is actually recognizing the logical volume as a file:

root@CmsrvVH3:~# virsh domblklist PCVIRTdra --details
Type       Device     Target     Source
------------------------------------------------
file       disk       vda        /dev/CmsrvVH3-vg/PCVIRTdra-ONDERHOUD
file       cdrom      hdb        /srv/poolVMS/Windows10_x64.iso
file       cdrom      hdc        /srv/poolVMS/virtiodrivers.iso

Is there a better way of doing this?

Thanks in advance,

Dominique.

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