On 07/02/2015 05:53 PM, Steffen Tilsch wrote: > Hello Cephers, > > Whenever I read about HDDs for OSDs it is told that "they will deliver > around 130 IOPS". > Where does this number come from and how it was measured (random/seq, how > big where the IOs, which queue-dephat what latency) or is it more a general > number depending on disk seek times? >
Yes, it's the rotation speed and head movements. But 130 IOps is high for a 7200RPM disk. Usually I use 100 or even 80 IOps as a rule of thumb. Harddrives are slow, very slow. > Regards and thanks for clarifying, > Steffen > > > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Wido den Hollander 42on B.V. Ceph trainer and consultant Phone: +31 (0)20 700 9902 Skype: contact42on _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
