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 <[email protected]> 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 > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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