On Sun, Jan 05, 2020 at 17:21:52 -0600, Eyüp Hakan Duran wrote:
Dear all,
Please let me start by indicating that I am not from a technical
background, so please be gentle and patient with me.
I am trying to get a snapshot from my virtual machines (vm) and the
following
command works for all of them bar one:
# virsh snapshot-create-as --quiesce --no-metadata --domain myvm myvm-state
--diskspec vda,file=overlay.qcow2 --disk-only --atomic
You can drop --atomic if you use a qemu released in at least last 5
years as the snapshot is always atomic if the qemu supports the
'transaction' command.
The only exception is this one vm, which has two disks as two separete
qcow2 files: vda and vdb. Vdb contains my nexcloud data, resides on a
btrfs subvolume, and a daily snapshot of this subvolume is taken by a
cronjob
by the host machine. Therefore, I do not want to include it in the
snapshot taken by virsh, and therefore I did not include vdb as a
separate --diskspec item, and used the same command indicated above.
However, this fails with the following behavior: a state (or rather
overlay file with a qcow2 extension is created on the host machine's
directory where the image of vdb exists. My question is the following:
Is there a way to direct virsh for only taking a snapshot ignoring one
of the disks? Yes, I can always create that second snapshot/overlay
Sure. Just use a second --diskspec vdb,snapshot=no
image of vdb and delete it later, but it doesn't feel very
intuitive,
and efficient. However, it is quite possible that I may be completely
overseeing an important aspect of the process, and this may not be possible
due to that :).
One disadvantage of the above operation is that the snapshot of vdb is
not from the same time as vda, but if that doesn't pose a problem in
your scenario it's okay to do it that way.
Thanks for your inputs in advance.
Hakan Duran
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