Hello, As far as I am correct you should weight the OSD's as per their capacity in CRUSH map.
Here is sample from ceph docs ( http://ceph.com/docs/master/rados/operations/crush-map/ ) *Weighting Bucket Items* *Ceph expresses bucket weights as doubles, which allows for fine weighting. A weight is the relative difference between device capacities. We recommend using 1.00 as the relative weight for a 1TB storage device. In such a scenario, a weight of 0.5 would represent approximately 500GB, and a weight of 3.00 would represent approximately 3TB. Higher level buckets have a weight that is the sum total of the leaf items aggregated by the bucket.* Regards, Sudarshan Pathak On Sun, Feb 1, 2015 at 4:24 AM, Howard Thomson <h...@thomsons.co.uk> wrote: > Hi All, > > I am developing a custom disk storage backend for the Bacula backup > system, and am in the process of setting up a trial Ceph system, > intending to use a direct interface to RADOS. > > I have a variety of 1Tb, 250Mb and 160Mb disk drives that I would like > to use, but it is not [as yet] obvious as to whether having differences > in capacity at different OSDs matters. > > Can anyone comment, or point me in the right direction on > docs.ceph.com ? > > Thanks, > > Howard > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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