On Wed, Oct 12, 2016 at 2:45 AM, Frédéric Nass <frederic.nass@xxxxxxxxxxxxxxxx> wrote: > Can we use rbd journaling without using rbd mirroring in Jewel ? Yes, you can use journaling without using rbd-mirroring, but ... >So that we > can set rbd journals on SSD pools and improve write IOPS on standard (no > mirrored) RBD images. > Assuming IOs are acknowleged when written to the journal pool. ... write ops are acked as soon as they are written to the in-memory cache or, if disabled, when the backing image is updated. The journal is not used to satisfy read-after-write requests, so we cannot ack a write op until a read can safely (and consistently) be performed -- either from the in-memory cache or from the backing image. There -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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