Re: [libvirt] vm snapshot multi-disk

>>> On 7/14/2015 at 05:42 AM, in message <CALFpzo551ioR=w5ASF7JXmtP8EgQSP2au_O6awmyofz9MfG3vg(a)mail.gmail.com&gt;, Marcus <shadowsor(a)gmail.com&gt; wrote: > 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 Just FYI, tested on my machine, libvirt 1.2.5, qemu 2.0.0, didn't see this problem. Both disk snapshots are deleted. > > > Also, I'm unclear if the domain snapshot feature is orchestralted 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-ad9c8b51a7a > 5 > > > > vdb > > > /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/7033e4c6-5f59-4325-b7e0-ae191e12e86 > c > > > > > > # qemu-img snapshot -l > > > /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/e4d6e885-1382-40bc-890b-ad9c8b51a7a > 5 > > > > 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-ae191e12e86 > c > > > > 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-ad9c8b51a7a > 5 > > > > # qemu-img snapshot -l > > > /mnt/2a270ef3-f389-37a4-942f-380bed9f70aa/7033e4c6-5f59-4325-b7e0-ae191e12e86 > c > > > > Snapshot list: > > > > ID TAG VM SIZE DATE VM CLOCK > > > > 1 1436792720 0 2015-07-13 06:05:20 00:01:10.938 > > >