On Tue, Jun 9, 2015 at 5:52 AM, David Z <david.z1003@xxxxxxxxx> wrote:
> Hi Ilya,
>
> Thanks for the reply. I knew that v2 image can be mapped if using default
> striping parameters without --stripe-unit or --stripe-count.
>
> It is just the rbd performance (IOPS & bandwidth) we tested hasn't met our
> goal. We found at this point OSDs seemed not to be the bottleneck, so we
> want to try "fancy striping".
>
> Do you know if there is an approximate ETA for this feature? Or it would be
> great that you could share some info on tuning rbd performance. Anything
> will be appreciated.
Your config, workload and some numbers would be helpful in getting
others to chime in. If the bottleneck seems to be the kernel client
try perf to see where the time gets spent. If it's a ceph-msgr kworker
then increasing the number of OSDs could help. I doubt lowering stripe
size to 8k would have helped here.
Thanks,
Ilya
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