Right Alessandro, and now, thiese are my questions:
1- "KVM live Backup" with the new code of backup, will do write cache for
use of the VM?
2- If the question above is correct, how much write cache will make this new
code of backup?
And the question more important:
3- If the first question is correct, is possible to make a new code of "KVM
live Backup" that don't make write cache for use of the VM and nor affect
the I/O performance of the VM (always thinking that the VM is in High
Availability)?
----- Original Message -----
From: "Alessandro Briosi" <a...@metalit.com>
To: "Dietmar Maurer" <diet...@proxmox.com>; "Cesar Peschiera"
<br...@click.com.py>; <pve-devel@pve.proxmox.com>
Sent: Tuesday, January 28, 2014 4:28 AM
Subject: Re: [pve-devel] KVM Live Backup performance
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
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