On Thu, May 17, 2018 at 11:03 AM, Jorge Pinilla López <jorp...@unizar.es> wrote:
> Thanks for the info!, I absolutely agree that it should be documented
>
> Any further info about why journaling feature is so slow?

Because everything is written twice: first to the journal and then to
the actual data objects.  journaling feature is disabled by default and
shouldn't be enabled unless you are setting up rbd-mirror:

  http://docs.ceph.com/docs/master/rbd/rbd-mirroring/

Thanks,

                Ilya
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