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

[Mark Nelson <mark.nelson@inktank.com>]

On 05/31/2012 09:42 AM, Yann Dupont wrote:
> 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,
Hi Yann,

Can you take a look at how many PGs are in each pool?

ceph osd pool get<pool>  pg_num


Thanks,
Mark