bad performance fio random write - rados bench random write to compare?

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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)

Regards,

Alexandre
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