[pve-devel] vm migration + storage migration with ndb workflow notes

[Dietmar Maurer]

I just found a patch from last week on the qemu-devel list:

[Qemu-devel] [PATCH v2 00/12] Drive mirroring performance	improvements

So I guess they are already aware of that problem.

> >>This should be as fast as qemu-img. Please can you post your findings
> >>on the pve-devel list - this looks like a serious bug to me.
> I'll send a msg to the qemu mailing.
> 
> Maybe with drive-mirror the target file is open in directsync ?
> 
> ----- Mail original -----
> 
> De: "Dietmar Maurer" <dietmar at proxmox.com>
> À: "Alexandre DERUMIER" <aderumier at odiso.com>
> Cc: pve-devel at pve.proxmox.com
> Envoyé: Lundi 21 Janvier 2013 10:18:20
> Objet: RE: [pve-devel] vm migration + storage migration with ndb workflow
> notes
> 
> > I see a big speed difference
> >
> > for a 32gb file, migrate on same local, qcow2 -> raw, both writeback
> >
> > qemu-img : 30s
> > drive-mirror (with paused vm) : 5min
> 
> This should be as fast as qemu-img. Please can you post your findings
> on the pve-devel list - this looks like a serious bug to me.