[pve-devel] KVM Live Backup performance

[Alessandro Briosi]

Il 28/01/2014 06:52, Dietmar Maurer ha scritto:
>> If is possible without lose performance into this VM, the write cache for "KVM
>> Live Backup" not must to execute it. In this mode the "KVM Live Backup" will be
>> fantastic.
> 
> Sorry, but I do not really understand that question?
> 
> We have done many improvement on backup code, so you should first test with the newest binaries
> available on the 'pvetest' repository.
> 

If I understood it correctly he is concerned about the new "KVM Live Backup"

He is complaining that the new code enables write cache during backup.
If there's a VM which is running a database in an HA scenario, and for
some reasons the VM/host crashes during the backup, the database would
be inconsistent when started on another host, cause of the write cache.

So he is asking if there's a way to disable/avoid KVM backup to use
write cache.

I have no idea if he's statement is correct though. Does really KVM
backup enable write cache ?

Alessandro