[root@controller ~]# ceph features { "mon": [ { "features": "0x3ffddff8ffacffff", "release": "luminous", "num": 1 } ], "osd": [ { "features": "0x3ffddff8ffacffff", "release": "luminous", "num": 14 } ], "client": [ { "features": "0x3ffddff8ffacffff", "release": "luminous", "num": 20 } ], "mgr": [ { "features": "0x3ffddff8ffacffff", "release": "luminous", "num": 1 } ] }
命令
ceph osd getmap {osdmap_filename}
[root@controller ~]# ceph osd getmap -o osd.map got osdmap epoch 52619
命令
osdmaptool {osdmap_filename} --upmap out.txt [--upmap-pool <pool>] [--upmap-max <max-count>] [--upmap-deviation <max-deviation>]
其中
upmap-pool ：指定需要优化均衡的存储池名
upmap-max： 指定一次优化的数据条目，默认100，可根据环境业务情况调整该值，一次调整的条目越多，数据迁移会越多，可能对环境业务造成影响。
max-deviation：最大偏差值，默认为0.01（即1％）。如果OSD利用率与平均值之间的差异小于此值，则将被视为完美。
假设只优化2条，即：
[root@controller ~]# osdmaptool osd.map --upmap out.txt --upmap-pool volumes --upmap-max=2 osdmaptool: osdmap file ‘osd.map‘ writing upmap command output to: out.txt checking for upmap cleanups upmap, max-count 2, max deviation 0.01 limiting to pools volumes (2)
[root@controller ~]# cat out.txt ceph osd pg-upmap-items 2.2de 10 5 ceph osd pg-upmap-items 2.2e1 8 5
从上述数据结果中
ceph osd pg-upmap-items 2.2de 10 5
表明pg 12.2de需从osd.10重新映射到osd.5
[root@controller ~]# set 2.2de pg_upmap_items mapping to [10->5] [root@controller ~]# set 2.2d1 pg_upmap_items mapping to [8->5]
原文：https://www.cnblogs.com/wangjq19920210/p/12787975.html