>>We still stop the VM for a short period, and I think vm_stop() flush all
>>driver cache.
ok. savevm state live -> pausevm ->disk snapshots-> unpausevm
seem good :)
I'll do tests this afternoon, I'll keep you in touch.
----- Mail original -----
De: "Dietmar Maurer" <diet...@proxmox.com>
À: "Alexandre DERUMIER" <aderum...@odiso.com>
Cc: pve-devel@pve.proxmox.com
Envoyé: Lundi 24 Septembre 2012 12:35:35
Objet: RE: [pve-devel] snapshot improvements
> do you think image = size of memory if enough ? (if we have some bytes
> more with incremental ?)
PVE/QemuServer.pm:
my $driver_state_size = 32; # assume 32MB is enough to safe all driver state;
my $size = $conf->{memory} + $driver_state_size;
> Also, any problem if some datas in vmstate need to be flushed to disk ?
We still stop the VM for a short period, and I think vm_stop() flush all driver
cache.
> I see that you have add a "use writeback cache" patch, maybe it's for that
> case ?
no, this is just for the state file itself.
> If yes, does it works with all devices (ide/scsi/virtio) ? (with any guest
> driver
> version)
why not? It is basically the same code as used for live migration.
But yes, we need to carefully test it ;-)
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