Better use fio.
Like fio -ioengine=rbd -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=128 -rw=randwrite -pool=rpool_hdd -runtime=60 -rbdname=testimg (for peak parallel random iops)
Or the same with -iodepth=1 for the latency test. Here you usually get
Or the same with -ioengine=libaio -filename=testfile -size=10G instead of -ioengine=rbd -pool=.. -rbdname=.. to test it from inside a VM.
...or the same with -sync=1 to determine how a DBMS will perform inside a VM...
--
With best regards,
Vitaliy Filippov
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