Re: rebalancing ceph cluster

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Hello everyone,

We have some osd on the ceph.
Some osd's usage is more than 77% and another osd's usage is 39% in the same host.

I wonder why osd’s usage is different.(Difference is large) and how can i fix it?

ID  CLASS   WEIGHT    REWEIGHT SIZE    USE     AVAIL   %USE  VAR  PGS TYPE NAME
 -2          93.26010        - 93.3TiB 52.3TiB 41.0TiB 56.04 0.98   -     host serverA
…...
 33 HDD  9.09511  1.00000 9.10TiB 3.55TiB 5.54TiB 39.08 0.68  66         osd.4
 45 HDD   7.27675  1.00000 7.28TiB 5.64TiB 1.64TiB 77.53 1.36  81         osd.7
…... 

-5          79.99017        - 80.0TiB 47.7TiB 32.3TiB 59.62 1.04   -     host serverB
  1 HDD   9.09511  1.00000 9.10TiB 4.79TiB 4.31TiB 52.63 0.92  87         osd.1
  6 HDD   9.09511  1.00000 9.10TiB 6.62TiB 2.48TiB 72.75 1.27  99         osd.6
 …...

Thank you

You can use upmap balancer since Ceph Liminous: http://docs.ceph.com/docs/luminous/mgr/balancer/



k

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