[pve-devel] KVM Live Backup performance

Stefan Priebe - Profihost AG s.priebe at profihost.ag
Sat Nov 23 15:51:42 CET 2013


> Am 23.11.2013 um 14:28 schrieb Michael Rasmussen <mir at datanom.net>:
> 
> On Sat, 23 Nov 2013 07:16:28 +0000
> Dietmar Maurer <dietmar at proxmox.com> wrote:
> 
>>> I agree, limiting IO from the VM during backup can have advantages.
>>> On the flip side loosing 50% of the IO
>> 
>> This 50% loose has nothing to do with the new backup algorithm, because
>> your test does not involve any writes. So it is more likely a bug in the
>> AIO code. I will dig deeper next week.
>> 
>> I wonder if such slowdown also happen with other KVM block jobs (storage migrate).
> I might just do because I seem to remember online migration failing
> with timeout errors as reason.

This is fixed with qemu 1.5 at least to me.

> 
> -- 
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> Michael Rasmussen
> 
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