Hello,
last year in june i already reported this but there was no real result.
(http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-July/041070.html)
I then had the hope that this will be fixed itself when hammer is
released. Now i tried hammer an the results are bad as before.
Since firefly librbd1 / librados2 are 20% slower for 4k random iop/s
than dumpling - this is also the reason why i still stick to dumpling.
I've now modified my test again to be a bit more clear.
Ceph cluster itself completely dumpling.
librbd1 / librados from dumpling (fio inside qemu): 23k iop/s for random
4k writes
- stopped qemu
- cp -ra firefly_0.80.8/usr/lib/librados.so.2.0.0 /usr/lib/
- cp -ra firefly_0.80.8/usr/lib/librbd.so.1.0.0 /usr/lib/
- start qemu
same fio, same qemu, same vm, same host, same ceph dumpling storage,
different librados / librbd: 16k iop/s for random 4k writes
What's wrong with librbd / librados2 since firefly?
Greets,
Stefan
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