On Tue, Jun 19, 2012 at 7:05 AM, Alexandre DERUMIER <aderumier@xxxxxxxxx> wrote: > Hi, > Is it possible to do random write bench with rados bench command ? > > I have very base random write performance with 4K block size inside qemu-kvm, > 1000 iops/s max with 3 nodes with 3x 5 disk 15k > (Maybe it's related to my constant disk writes, like datas are not flushed sequentially to disk) > > seekwatcher movie of 1 osd here : > http://odisoweb1.odiso.net/random-write-4k.mpg > > I would like to do tests on kvm host with rados command to compare. > (I don't have rbd module in my kvm host kernel,so I can't use fio on the host) Unfortunately, nobody's implemented a random write test in rados bench yet (this might be a good bug for somebody who's interested in getting in to the project — rados bench is pretty simple). I'd offer more suggestions but I think we've already discussed this elsewhere. :) -Greg PS: Sorry this message got lost. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
