On Tue, Dec 22, 2015 at 9:29 PM, Francois Lafont <flafdivers@xxxxxxx> wrote: > Hello, > > On 21/12/2015 04:47, Yan, Zheng wrote: > >> fio tests AIO performance in this case. cephfs does not handle AIO >> properly, AIO is actually SYNC IO. that's why cephfs is so slow in >> this case. > > Ah ok, thanks for this very interesting information. > > So, in fact, the question I ask myself is: how to test my cephfs > to know if I have correct (or not) perfs as regard my hardware > configuration? > > Because currently, in fact, I'm unable to say if I have correct perf > (not incredible but in line with my hardware configuration) or if I > have a problem. ;) > It's hard to tell. basically data IO performance on cephfs should be similar to data IO performance on rbd. Regards Yan, Zheng > -- > François Lafont _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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