understanding pool capacity and usage

Anton Aleksandrov <anton@xxxxxxxxxxxxxx> · Fri, 27 Jul 2018 13:23:48 +0300



    Hello,
    Might sounds strange, but I could not find answer in google or
      docs, might be called somehow else. 

    
    I dont understand pool capacity policy and how to set/define it.
      I have created simple cluster for CephFS on 4 servers, each has
      30gb disk - so in total 120gb. On top I build replicated metapool
      with size of 3 and erasure pool for data k=2, m=1. Made CephFS,
      things look good. "ceph df" shows, that not all space is used. 

    
    ceph df

      GLOBAL:

          SIZE     AVAIL      RAW USED     %RAW USED

          119G     68941M       53922M         43.89

      POOLS:

          NAME                ID     USED       %USED     MAX AVAIL    
      OBJECTS

          cephfs_data         1      28645M     42.22       
      39210M       61674

          cephfs_metadata     2        171M      0.87       
      19605M        1089

    
    pg_num for medata is 8

      pg_num for data is 40

    
    Am I doing anything wrong? I want as much space for data as
      possible.
    Anton

    
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