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 <hat@xxxxxxxxxxxxxx> 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
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