Bitmap already exists

[billystaggs]

I am unable to run a Full or Inc backup. A offline copy works fine. I do not show any checkpoints. What am I doing wrong?

[2024-07-24 17:15:29] ERROR root virtnbdbackup - startBackupJob [MainThread]: Failed to start backup: [internal error: unable to execute QEMU command 'transaction': Bitmap already exists: virtnbdbackup.0]

root@leo:/media/TR002/vmbackups/gibson/Hourly # virsh checkpoint-list Debian01
Name Creation Time

Thanks,

bstaggs

[abbbi]

Pls Check past issues and discussions on this. There is an inconsistency between which bitmaps/checkpoints libvirt thinks and which ones are actually defined in the qemu disk image. Use qemu-img Tool to cleanup/Remove the bitmap and Start over

Also Check the readme Part for backup in transient/Cluster envs if your domains are migrated between hosts which can also Clause this Situation

[billystaggs]

Thanks for the reply. The domain was not migrated in my case. I will research the gemu-img tool.

[billystaggs]

Thanks for pointing me in the right direction. Backups seem to be working again. Just in case it helps someone else:
qemu-img info filename.qcow2
qemu-img bitmap --remove filename.qcow2 virtnbdbackup.0

Thanks again.

[abbbi]

ive added an FAQ for this now:

https://github.com/abbbi/virtnbdbackup?tab=readme-ov-file#backup-fails-with-unable-to-execute-qemu-command-transaction-bitmap-already-exists