[SOLVED] dirty-bitmap status: existing bitmap was invalid and has been cleared

[RobFantini]

We backup a particular KVM to two different datastores.

to one datastore the backup takes 10-11 minutes each time . to the other datastore the backup time is less then 20 seconds.

backup to the slow data store has the following messages in log:

INFO: scsi0: dirty-bitmap status: existing bitmap was invalid and has been cleared
INFO: scsi2: dirty-bitmap status: existing bitmap was invalid and has been cleared

Any clues to fix this issue?

 

[Neobin]

The dirty bitmap is bound to a datastore. So, if you backup a VM to a second/another datastore, the dirty bitmap gets invalid.

Recommendation would be, to ever backup only to one datastore and then sync it/them to the other datastore(s):
https://pbs.proxmox.com/docs/managing-remotes.html
(Local to local datastore is also possible.)