dirty-bitmap is used but no reduction

S

stormtronix

Renowned Member
Jul 23, 2014
33
1
73
I just setup the first test-backup- server and made the first backup of a VM with a 87GB Disk - workes as intended and backed up the 87 GB.

1 hour later I made a second backup, but all the 87GB are backed up again - what could be the issue?

INFO: using fast incremental mode (dirty-bitmap), 87.0 GiB dirty of 87.0 GiB total

the space-usage on the datastore was not affected, no space was used, but the backup took almost the same time and reads/sends everything again
 
your pveversion -v?

did you start/stop your VM?

what services are running inside?
 
stormtronix said:
1 hour later I made a second backup, but all the 87GB are backed up again - what could be the issue?
Click to expand...

Does this VM has an EFI disk? Can you try triggering an additional (live) backup, so that it would be the third one since the VM was started.

Please also post the line after backup was done, i.e. looking something like:
INFO: backup was done incrementally, reused 47.46 GiB (98%)
Click to expand...
 
tom said:
your pveversion -v?

-the newest from pve-nosubscription, checked it according to yor recommendation

did you start/stop your VM?

-no, the vm was running

what services are running inside?

-inside the vm? it is a mailserver, sending only few mails/h
Click to expand...
 
t.lamprecht said:
Does this VM has an EFI disk? Can you try triggering an additional (live) backup, so that it would be the third one since the VM was started.

Please also post the line after backup was done, i.e. looking something like:
Click to expand...

will do this tomorrow
 
OK - it worked: ...604.0 MiB dirty of 87.0 GiB total ... Backup took only 26s on an old and slow Server - great!

Maybe the time between the first two backups was too short, it was 40 min - not an hour as mentioned before


pls get hte file-browsing done and release for production, we were really waiting for this!
 
hi, i'm testing PBS, and i have same test Virtual Machine.
if the virtual machine is shutdown i see that the backup is full, if the virtual machine is start the backup use incremental mode (dirty-bitmap)....
Is this correct???
 
stormtronix said:
Maybe the time between the first two backups was too short, it was 40 min - not an hour as mentioned before
Click to expand...

That time should not matter. Can you confirm that the respective VM uses an EFI disk and OVMF as firmware?
 
  • Like
Reactions: menk
You must log in or register to reply here.
Top Bottom