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I'm going to assume you know how to add and remove storage
http://docs.ceph.com/docs/hammer/rados/operations/add-or-rm-osds/. The only other part of this process is reweighting the crush map for the old osds to a new weight of 0.0
http://docs.ceph.com/docs/master/rados/operations/crush-map/.
I would recommend setting the nobackfill and norecover flags. ceph osd set nobackfill ceph osd set norecover Next you would add all of the new osds according to the ceph docs and then reweight the old osds to 0.0. ceph osd crush reweight osd.1 0.0 Once you have all of that set, unset nobackfill and norecover. ceph osd unset nobackfill ceph osd unset norecover Wait until all of the backfilling finishes and then remove the old SAN osds as per the ceph docs. There is a thread from this mailing list about the benefits of weighting osds to 0.0 instead of just removing them. The best thing that you gain from doing it this way is that you can remove multiple nodes/osds at the same time without having degraded objects and especially without losing objects.
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