unable to execute QEMU command 'transaction': Bitmap already exists about virtnbdbackup

[abbbi]

it seems your setup is losing checkpoint information if resource is removed.Thats an issue with your environment rather than virtnbdbackup. Information about checkpoints and its bitmaps is stored at two places:

• libvirt
• the qcow image of the disk

virtnbdbackup attempts to create the checkpoint because according to libvirt it doesnt exist, but the qcow image still
has the bitmap for the checkpoint set.

You have to find out why your "pcs resource disable vm-template" command removes the checkpoint information but leaves
the bitmap intact..., i have not seen such things happening wiht "virsh" so i guess you need to fix your setup.

You now need to use qemu direct commands like block-dirty-bitmap-remove to remove the dangling bitmap from the qcow image information using the QMP layer (see: https://qemu-project.gitlab.io/qemu/interop/bitmaps.html)

[ccrssaa]

Thanks, going to check, probably because VMs are transient in Pacemaker

Was able to dump checkpoint to file first

virsh checkpoint-dumpxml vm-template --checkpointname virtnbdbackup > tmp.xml

then recreate it after stop/start

virsh checkpoint-create vm-template --redefine --xmlfile tmp.xml

Thinking about implementing "redefine lost transient VM checkpoints using virtnbdbackup logs " as a workaround

[abbbi]

Thanks, going to check, probably because VMs are transient in Pacemaker

yes, most probably. I think qemu-img also has an bitmap option that can remove bitmaps from qcow files.

[abbbi]

Ive pushed a small fix to master branch. Virtnbdbackup should now thaw the filesystems if starting the backup job fails with an exception, that should at least not block your filesystems within the VM in case such an situation happens again :)