Keep dirty-bitmap status: OK with snapshot?

[ozgurerdogan]

When I reboot node, all bitmap status will be cleared and next backup will be full right?
What if I take snapshot of kvm with memory status and reboot node and restore zfs snapshot? Will bitmap status ok this time?

 

[_gabriel]

all bitmap status will be cleared and next backup will be full right?

not really :
from PBS point of view, all backups are full but all data are dedup = same data can't exist twice in the PB Datastore (.chunks subfolders)
bitmap state is QEMU side which speedup backup skipping full read of guest vdisk.
when bitmap is new, full read of guest vdisk is required because QEMU didn't know what blocks were changed.
PBS doesn't care about bitmap status : even if full read of guest vdisk is done, only new data is written/transfered, already existing data in PBS Datastore is discarded thanks to dedup.