Hi, yesterday I expand our 3-Node ceph-cluster with an fourth node (additional 13 OSDs - all OSDs have the same size (4TB)). I use the same command like before to add OSDs and change the weight: ceph osd crush set 44 0.2 pool=default rack=unknownrack host=ceph-04 But ceph osd tree show all OSDs not below unknownrack and the weighting seems to be different (because with an weight of 0.8 the OSD are almost full - switched back to 0.6) root@ceph-04:~# ceph osd tree # id weight type name up/down reweight -1 46.8 root default -3 39 rack unknownrack -2 13 host ceph-01 0 1 osd.0 up 1 1 1 osd.1 up 1 ... 27 1 osd.27 up 1 28 1 osd.28 up 1 -4 13 host ceph-02 10 1 osd.10 up 1 11 1 osd.11 up 1 ... 32 1 osd.32 up 1 33 1 osd.33 up 1 -5 13 host ceph-03 16 1 osd.16 up 1 18 1 osd.18 up 1 ... 37 1 osd.37 up 1 38 1 osd.38 up 1 -6 7.8 host ceph-04 39 0.6 osd.39 up 1 40 0.6 osd.40 up 1 ... 50 0.6 osd.50 up 1 51 0.6 osd.51 up 1 How can I change ceph-04 to be part of rack unknownrack? If I change that, would the content of the OSDs from ceph-04 roughly the same, or move the "whole" content again? Thanks for feedback! regards Udo
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