ceph osd df tree ID CLASS WEIGHT REWEIGHT SIZE USE AVAIL %USE VAR PGS TYPE NAME -1 3.44714 - 588G 80693M 509G 0 0 - root default -9 0.57458 - 588G 80693M 509G 13.39 1.13 - host osd01 5 hdd 0.57458 1.00000 588G 80693M 509G 13.39 1.13 64 osd.5 -7 1.14899 - 1176G 130G 1046G 11.06 0.94 - host osd02 0 hdd 0.57500 1.00000 588G 70061M 519G 11.63 0.98 50 osd.0 1 hdd 0.57500 1.00000 588G 63200M 526G 10.49 0.89 41 osd.1 -3 1.14899 - 1176G 138G 1038G 11.76 1.00 - host osd03 2 hdd 0.57500 1.00000 588G 68581M 521G 11.38 0.96 48 osd.2 3 hdd 0.57500 1.00000 588G 73185M 516G 12.15 1.03 53 osd.3 -4 0.57458 - 0 0 0 0 0 - host osd04 4 hdd 0.57458 0 0 0 0 0 0 0 osd.4
By adding new hosts with half of osds of present hosts you a imbalance your crush.
osd.4 and osd.5 do double work in compare with present hosts if your failure domain is host.
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