Hi all.
I'm having issues while creating snapshots.
I posted on Stack Exchange [1], but figured I might get more success
here.
My VM backup script fails while creating the snapshot.
virsh snapshot-create-as --domain machine_1 snap --diskspec
vda,file=/srv/test/test-snap.qcow2 --disk-only --atomic --no-metadata
--quiesce
error: Requested operation is not valid: domain is already quiesced
Even after a VM reboot, the system is still quiesced and I get the same
error.
I thought quiesce means FS freeze, but this makes no sense since I can
still write to the FS when logged in the faulty VMs. And this would not
survive a reboot, right?
Could it be a communication issue that makes the host think the GA says
the machine is quiesced while it is not?
In any case, is there a command to enquire the quiesce state (apart from
attempting a snapshot and see if I get an error)?
Assuming the faulty VMs went quiesced after a unreproducible error, I
could fix that by exiting quiesced state, whatever that means. Is there
a virsh command to unquiesce the VM?
The whole backup procedure used to work and now it fails on 2 VMs but
still works on 2 others and I can't think of any relevant difference
between them.
Software versions:
- Host is Debian Jessie with qemu-kvm 2.8+dfsg-3~bop8+1 from backports.
- Guests are Debian Stretch with qemu-guest-agent 2.8+dfsg-6+deb9u4.
(For the record, the backup script is on GitHub [2]. Basically, what it
does is 1/ create snapshot, 2/ copy, 3/ commit snapshot.)
If I remove the `quiesce` option from the snapshot command line, things
work smooth. But obviously, this is not ideal.
Thanks for any hint.
[1]
https://serverfault.com/questions/917247/virsh-error-domain-is-already-quiesced
[2] https://github.com/Nobatek/vmbackup/blob/master/vmbackup
--
Jérôme
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