Hi Kate, Thanks for your reply. We currently use xfs as created by ceph-deploy.
What would you recommend we try? Kind regards, Tom On Tue, Nov 29, 2016 at 11:14 AM, Kate Ward <kate.w...@forestent.com> wrote: > What filesystem do you use on the OSD? Have you considered a different > filesystem that is better at combining requests before they get to the > drive? > > k8 > > On Tue, Nov 29, 2016 at 9:52 AM Thomas Bennett <tho...@ska.ac.za> wrote: > >> Hi, >> >> We have a use case where we are reading 128MB objects off spinning disks. >> >> We've benchmarked a number of different hard drive and have noticed that >> for a particular hard drive, we're experiencing slow reads by comparison. >> >> This occurs when we have multiple readers (even just 2) reading objects >> off the OSD. >> >> We've recreated the effect using iozone and have noticed that once the >> record size drops to 4k, the hard drive miss behaves. >> >> Is there a setting on Ceph that we can change to fix the minimum read >> size when the ceph-osd daemon reads the object of the hard drives, to see >> if we can overcome the overall slow read rate. >> >> Cheers, >> Tom >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > -- Thomas Bennett SKA South Africa Science Processing Team Office: +27 21 5067341 Mobile: +27 79 5237105
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