Re: poor OSD performance using kernel 3.4 => problem found

[Yann Dupont <Yann.Dupont@univ-nantes.fr>]

On 31/05/2012 15:45, Yann Dupont wrote:
> On 31/05/2012 15:37, Stefan Priebe - Profihost AG wrote:

> what puzzles me is that this morning, with 3.4.0 it was rbd that was
> stable, and now I have the exact contrary.
>
> I'll begin to reboot with old 3.4.0 kernel to see if things are
> reproductible.
>
> Cheers,


I'd say my problem is probably not related. Freshly rebooting all osd 
nodes with 3.4.0 kernel (the same kernel I used this morning) now gives 
pool data stable & rbd unstable. As with current git, and the exact 
opposite of results I had tuesday & this morning.

Go figure.

Could it have to do with previous usage in OSD ? or active mds ? or mon ?

As I already said, as my osd are using btrfs with big medata features, 
so going back in 3.0 kernel need a complete reformat of my OSD before.

But I will do it if you judge it can bring some light on this case.

Cheers,
-- 
Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont@univ-nantes.fr


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