There's an issue in master branch temporarily that makes rbd reads greater than the cache size hang (if the cache was on). This might be that. (Jason is working on it: http://tracker.ceph.com/issues/9854) -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com On Thu, Oct 23, 2014 at 5:09 PM, Mark Kirkwood <mark.kirkwood@xxxxxxxxxxxxxxx> wrote: > I'm doing some fio tests on Giant using fio rbd driver to measure > performance on a new ceph cluster. > > However with block sizes > 1M (initially noticed with 4M) I am seeing > absolutely no IOPS for *reads* - and the fio process becomes non > interrupteable (needs kill -9): > > $ ceph -v > ceph version 0.86-467-g317b83d (317b83dddd1a917f70838870b31931a79bdd4dd0) > > $ fio --version > fio-2.1.11-20-g9a44 > > $ fio read-busted.fio > env-read-4M: (g=0): rw=read, bs=4M-4M/4M-4M/4M-4M, ioengine=rbd, iodepth=32 > fio-2.1.11-20-g9a44 > Starting 1 process > rbd engine: RBD version: 0.1.8 > Jobs: 1 (f=1): [R(1)] [inf% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta > 1158050441d:06h:58m:03s] > > This appears to be a pure fio rbd driver issue, as I can attach the relevant > rbd volume to a vm and dd from it using 4M blocks no problem. > > Any ideas? > > Cheers > > Mark > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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