Nice article on write latency. If i understand correctly, this latency is measured while there is no overflow of the journal caused by long sustained writes else you will start hitting the HDD latency. Also queue depth you use is 1 ? Will be interested to see your article on hardware. /Maged > 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. > > Nick > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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