On 07/10/2017 01:51 PM, Jason Dillaman wrote: > On Mon, Jul 10, 2017 at 1:39 PM, Maged Mokhtar <mmokhtar@xxxxxxxxxxx> wrote: >> These are significant differences, to the point where it may not make sense >> to use rbd journaling / mirroring unless there is only 1 active client. > I interpreted the results as the same RBD image was being concurrently > used by two fio jobs -- which we strongly recommend against since it > will result in the exclusive-lock ping-ponging back and forth between > the two clients / jobs. Each fio RBD job should utilize its own > backing image to avoid such a scenario. > That is correct. The single job runs are more representative of the overhead of journaling only, and it is worth noting the (expected) inefficiency of multiple clients for the same RBD image, as explained by Jason. Mohamad _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |