Hi, What is the recommended procedure for replacing an osd with a larger osd in a safe and efficient manner, i.e. whilst maintaining redundancy and causing the least data movement? Would this be a matter of adding the new osd into the crush map whilst reducing the weight of the old osd to zero, then once the dust has settled, removing the old osd from the crush map? Assuming that's the general process, if replacing multiple osds with larger ones, is it safer and/or more efficient to do this sequentially (i.e. add new1 and set old1 weight to zero, wait for movement to finish, add new2 and set old2 to weight to zero, wait etc.) or do them all at once? It's my understanding that even if an osd is unused, removing it from the crush map can change placement calculations thus causing data movement. Is this the case? If so, this would indicate that, even if replacing multiple osds is better done sequentially, it would still be more efficient to remove all the old osds in one go at the end, correct? (I'm currently on Dumpling, if it matters.) Cheers, Chris _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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