What queue depth are you testing at?
You will struggle to get much more than about 500iops for a single threaded write, no matter what the backing disk is. Nick From: ceph-users [mailto:[email protected]] On Behalf Of [email protected] Sent: 27 May 2015 00:55 To: Vasiliy Angapov; Karsten Heymann Cc: ceph-users Subject: Re: [ceph-users] SSD IO performance Hi, Sorry for all , the network is 1000Mbit/s ,I've a state erroe before! The network is not 100Mbit/s . _____ [email protected] <mailto:[email protected]> From: Vasiliy Angapov <mailto:[email protected]> Date: 2015-05-26 22:36 To: Karsten Heymann <mailto:[email protected]> ; [email protected] <mailto:[email protected]> CC: ceph-users <mailto:[email protected]> Subject: Re: [ceph-users] SSD IO performance Hi, Hi, I guess the author here means that for random loads 100Mb network should generate 2500-3000 IOPS for 4k blocks. So the complaint is reasonable, I suppose. Regards, Vasily. On Tue, May 26, 2015 at 5:27 PM, Karsten Heymann <[email protected] <mailto:[email protected]> > wrote: Hi , you should definitely increase the speed of the network. 100Mbit/s is way too slow for all use cases I could think of, as it results in a maximum data transfer of less than 10 Mbyte per second, which is slower than a usb 2.0 thumb drive. Best, Karsten 2015-05-26 15:53 GMT+02:00 [email protected] <mailto:[email protected]> <[email protected] <mailto:[email protected]> >: > > Hi ALL: > I've built a ceph0.8 cluster including 2 nodes ,which contains 5 > osds(ssd) each , with 100MB/s network . Testing a rbd device with default > configuration ,the result is no ideal.To got better performance ,except the > capability of random r/w of SSD, which should to give a change? > > 2 nodes 5 osds(SSD) *2 , 1 mon, 32GB RAM > 100MB/S network > and now the whole iops is just 500 . Should we change the filestore or > journal part ? Thanks for any help! > > ________________________________ > [email protected] <mailto:[email protected]> > > _______________________________________________ > ceph-users mailing list > [email protected] <mailto:[email protected]> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list [email protected] <mailto:[email protected]> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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