Re: [libvirt] vm snapshot multi-disk

Oh, I almost forgot to mention the versions: libvirt 1.2.8-16.0.1.el7_1.2.x86_64 qemu 2.1.2-23.el7_1.1.x86_64 Also, I'm unclear if the domain snapshot feature is orchestrated by libvirt, or something that is simply called into qemu to take care of. Please forgive me if this is a qemu issue. On Mon, Jul 13, 2015 at 2:35 PM, Marcus <shadowsor(a)gmail.com&gt; wrote: > 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 >