Hi Nick, thanks for sharing your results. Would you be able to share the fio args you used for benchmarking (especially the ones for the screenshot you shared in the write latency post)? What I found is that when I do some 4k write benchmarks my lat stdev is much higher then the average (also wider range for min vs max than). So I wondered if it's my parameters or the cluster. Greetings -Sascha- Am 11.11.2016 um 20:33 schrieb Nick Fisk: > Hi All, > > I've recently put together some articles around some of the performance testing I have been doing. > > The first explores the high level theory behind latency in a Ceph infrastructure and what we have managed to achieve. > > http://www.sys-pro.co.uk/ceph-write-latency/ > > The second explores some of results we got from trying to work out how much CPU a Ceph IO uses. > > http://www.sys-pro.co.uk/how-many-mhz-does-a-ceph-io-need/ > > I hope they are of interest to someone. > > I'm currently working on a couple more explaining the choices behind the hardware that got us 700us write latency and what we > finally built. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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