Re: [libvirt] vm snapshot multi-disk

Hi all, I've recently been toying with VM snapshots, and have ran into an issue. Given a VM with multiple disks, it seems a snapshot-create followed by a snapshot-delete will only remove the qcow2 snapshot for the first disk (or perhaps just the disk that contains the memory), not all of the disk snapshots it created. Is this something people are aware of? In searching around, I found a bug report where snapshot-creates would fail due to the qcow2 snapshot ids being inconsistent. That looks like it is patched for 2.4 qemu ( http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg04963.html), this bug would trigger that one by leaving IDs around that are inconsistent between member disks, but is not the same. # virsh snapshot-create 7 Domain snapshot 1436792720 created # virsh snapshot-list 7 Name Creation Time State ------------------------------------------------------------ 1436792720 2015-07-13 06:05:20 -0700 running # virsh domblklist 7 Target Source ------------------------------------------------ vda /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/e4d6e885-1382-40bc-890b-ad9c8b51a7a5 vdb /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/7033e4c6-5f59-4325-b7e0-ae191e12e86c # qemu-img snapshot -l /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/e4d6e885-1382-40bc-890b-ad9c8b51a7a5 Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 1436792720 173M 2015-07-13 06:05:20 00:01:10.938 # qemu-img snapshot -l /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/7033e4c6-5f59-4325-b7e0-ae191e12e86c Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 1436792720 0 2015-07-13 06:05:20 00:01:10.938 # virsh snapshot-delete 7 1436792720 Domain snapshot 1436792720 deleted # qemu-img snapshot -l /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/e4d6e885-1382-40bc-890b-ad9c8b51a7a5 # qemu-img snapshot -l /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/7033e4c6-5f59-4325-b7e0-ae191e12e86c Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 1436792720 0 2015-07-13 06:05:20 00:01:10.938