Re: balance OSD usage.

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Which Ceph release are you running?

You mention the balancer, which would imply a certain lower bound.  

What does `ceph balancer status` show?

> 
> Does anyone know how I can rebalance my cluster to balance out the OSD
> usage?
> 
> 
> 
> I just added 12 more 14Tb HDDs  to my cluster (cluster of made up of 12Tb
> and 14Tb disks) bringing my total to 48 OSDs. Ceph df reports my pool as 83%
> full (see below). I am aware this only reports the fullest drive. However,
> after backfilling, data distribution is still heavily skewed to a few OSDs.
> The oldest are at ~80% and the newest are at ~50.  My issue is that data is
> currently being written to all drives equally and at this rate the cluster
> will start disabling writes despite still having significant raw capacity.
> PGs do not seem to be evenly distributed either. Weights are 12.73 for all
> 14Tb OSD and 10.9 for all 12Tb OSDs. I tried using the balancer to create a
> new plan but it had no real effect. Haven't seen much useful info online.
> 
> --- RAW STORAGE ---
> 
> CLASS  SIZE     AVAIL    USED     RAW USED  %RAW USED
> 
> hdd    582 TiB  203 TiB  379 TiB   380 TiB      65.20
> 
> TOTAL  582 TiB  203 TiB  379 TiB   380 TiB      65.20
> 
> 
> 
> --- POOLS ---
> 
> POOL                   ID  STORED   OBJECTS  USED     %USED  MAX AVAIL
> 
> cephfs_data             2  261 TiB   68.62M  379 TiB  83.64     56 TiB
> 
> cephfs_metadata         3  536 MiB   12.74k  1.6 GiB      0     25 TiB
> 
> 
> 
> `osd df`:
> 
> ID  CLASS  WEIGHT    REWEIGHT  SIZE     RAW USE  DATA     OMAP     META
> AVAIL    %USE   VAR   PGS  STATUS
> 
> 0    hdd  10.91409   1.00000   11 TiB  8.4 TiB  8.4 TiB  1.6 MiB   22 GiB
> 2.5 TiB  77.00  1.18   92      up
> 
> 4    hdd  10.91409   1.00000   11 TiB  6.9 TiB  6.9 TiB   21 MiB   18 GiB
> 4.0 TiB  63.03  0.97   80      up
> 
> 5    hdd  10.91409   1.00000   11 TiB  6.5 TiB  6.5 TiB  1.3 MiB   17 GiB
> 4.4 TiB  59.50  0.91   71      up
> 
> 11    hdd  12.73340   1.00000   13 TiB  9.4 TiB  9.4 TiB   36 MiB   24 GiB
> 3.3 TiB  74.13  1.14  105      up
> 
> 15    hdd  12.73340   1.00000   13 TiB  8.2 TiB  8.2 TiB   20 MiB   21 GiB
> 4.5 TiB  64.75  0.99   99      up
> 
> 16    hdd  10.91409   1.00000   11 TiB  6.4 TiB  6.4 TiB  1.7 MiB   16 GiB
> 4.5 TiB  58.81  0.90   74      up
> 
> 20    hdd  12.73340   1.00000   13 TiB  8.4 TiB  8.4 TiB   33 MiB   23 GiB
> 4.3 TiB  66.09  1.01  102      up
> 
> 22    hdd  12.73340   1.00000   13 TiB  8.6 TiB  8.6 TiB  3.3 MiB   22 GiB
> 4.1 TiB  67.48  1.04  100      up
> 
> 23    hdd  12.73340   1.00000   13 TiB  7.6 TiB  7.6 TiB  406 KiB   20 GiB
> 5.1 TiB  59.93  0.92   89      up
> 
> 36    hdd  12.73340   1.00000   13 TiB  7.3 TiB  7.2 TiB  171 KiB   16 GiB
> 5.5 TiB  57.00  0.87   85      up
> 
> 41    hdd  12.73340   1.00000   13 TiB  7.0 TiB  7.0 TiB  2.1 MiB   16 GiB
> 5.7 TiB  54.85  0.84   85      up
> 
> 46    hdd  12.73340   1.00000   13 TiB  8.1 TiB  8.0 TiB   67 MiB   19 GiB
> 4.7 TiB  63.34  0.97   99      up
> 
> 3    hdd  10.91409   1.00000   11 TiB  7.6 TiB  7.6 TiB  1.0 MiB   19 GiB
> 3.3 TiB  69.85  1.07   87      up
> 
> 6    hdd  10.91409   1.00000   11 TiB  8.3 TiB  8.3 TiB   39 MiB   22 GiB
> 2.6 TiB  76.28  1.17   93      up
> 
> 10    hdd  12.73340   1.00000   13 TiB  9.6 TiB  9.6 TiB  5.1 MiB   24 GiB
> 3.1 TiB  75.52  1.16  109      up
> 
> 14    hdd  12.73340   1.00000   13 TiB  8.9 TiB  8.8 TiB   34 MiB   22 GiB
> 3.9 TiB  69.57  1.07   99      up
> 
> 24    hdd  12.73340   1.00000   13 TiB   11 TiB   11 TiB   22 MiB   34 GiB
> 2.1 TiB  83.28  1.28  117      up
> 
> 25    hdd  12.73340   1.00000   13 TiB  8.4 TiB  8.4 TiB   24 MiB   21 GiB
> 4.4 TiB  65.84  1.01   97      up
> 
> 26    hdd  12.73340   1.00000   13 TiB  8.9 TiB  8.9 TiB  205 KiB   22 GiB
> 3.8 TiB  69.84  1.07  102      up
> 
> 30    hdd  10.91409   1.00000   11 TiB  6.9 TiB  6.9 TiB   33 MiB   16 GiB
> 4.0 TiB  63.31  0.97   92      up
> 
> 39    hdd  12.73340   1.00000   13 TiB  7.2 TiB  7.2 TiB   36 MiB   16 GiB
> 5.6 TiB  56.39  0.86   93      up
> 
> 43    hdd  12.73340   1.00000   13 TiB  8.3 TiB  8.3 TiB  3.6 MiB   19 GiB
> 4.4 TiB  65.54  1.01   98      up
> 
> 47    hdd  12.73340   1.00000   13 TiB  7.1 TiB  7.1 TiB   51 MiB   17 GiB
> 5.6 TiB  55.70  0.85   88      up
> 
> 2    hdd  10.91409   1.00000   11 TiB  7.4 TiB  7.3 TiB   22 KiB   19 GiB
> 3.6 TiB  67.36  1.03   82      up
> 
> 7    hdd  10.91409   1.00000   11 TiB  8.5 TiB  8.5 TiB  530 KiB   21 GiB
> 2.4 TiB  77.89  1.19   97      up
> 
> 8    hdd  12.73340   1.00000   13 TiB  8.5 TiB  8.5 TiB   21 MiB   22 GiB
> 4.3 TiB  66.53  1.02   99      up
> 
> 12    hdd  12.73340   1.00000   13 TiB  8.5 TiB  8.5 TiB   20 MiB   22 GiB
> 4.2 TiB  67.13  1.03   99      up
> 
> 18    hdd  12.73340   1.00000   13 TiB  9.9 TiB  9.9 TiB   24 MiB   31 GiB
> 2.8 TiB  77.81  1.19  112      up
> 
> 19    hdd  12.73340   1.00000   13 TiB  8.8 TiB  8.8 TiB   34 MiB   22 GiB
> 3.9 TiB  69.17  1.06  104      up
> 
> 21    hdd  12.73340   1.00000   13 TiB  9.5 TiB  9.4 TiB   15 MiB   28 GiB
> 3.3 TiB  74.37  1.14  111      up
> 
> 31    hdd  10.91409   1.00000   11 TiB  6.3 TiB  6.3 TiB   56 MiB   14 GiB
> 4.6 TiB  57.53  0.88   77      up
> 
> 32    hdd  10.91409   1.00000   11 TiB  8.0 TiB  8.0 TiB   44 MiB   18 GiB
> 2.9 TiB  73.15  1.12   99      up
> 
> 37    hdd  12.73340   1.00000   13 TiB  8.2 TiB  8.1 TiB  4.2 MiB   18 GiB
> 4.6 TiB  64.09  0.98   94      up
> 
> 40    hdd  12.73340   1.00000   13 TiB  7.3 TiB  7.3 TiB  1.4 MiB   16 GiB
> 5.5 TiB  57.10  0.88   86      up
> 
> 44    hdd  12.73340   1.00000   13 TiB  7.7 TiB  7.7 TiB  2.6 MiB   17 GiB
> 5.0 TiB  60.55  0.93   92      up
> 
> 1    hdd  10.91409   1.00000   11 TiB  5.9 TiB  5.9 TiB   55 MiB   15 GiB
> 5.0 TiB  54.14  0.83   72      up
> 
> 9    hdd  12.73340   1.00000   13 TiB  9.4 TiB  9.3 TiB  705 KiB   24 GiB
> 3.4 TiB  73.57  1.13  109      up
> 
> 13    hdd  12.73340   1.00000   13 TiB  8.0 TiB  8.0 TiB   22 MiB   21 GiB
> 4.7 TiB  62.74  0.96   91      up
> 
> 17    hdd  10.91409   1.00000   11 TiB  7.5 TiB  7.5 TiB   24 MiB   19 GiB
> 3.4 TiB  68.88  1.06   88      up
> 
> 27    hdd  12.73340   1.00000   13 TiB  6.9 TiB  6.8 TiB  4.8 MiB   17 GiB
> 5.9 TiB  53.81  0.83   78      up
> 
> 28    hdd  12.73340   1.00000   13 TiB  7.7 TiB  7.7 TiB   19 MiB   20 GiB
> 5.0 TiB  60.46  0.93   91      up
> 
> 29    hdd  12.73340   1.00000   13 TiB  8.3 TiB  8.3 TiB   17 MiB   21 GiB
> 4.4 TiB  65.56  1.01  100      up
> 
> 33    hdd  10.91409   1.00000   11 TiB  6.5 TiB  6.5 TiB  1.6 MiB   15 GiB
> 4.4 TiB  59.23  0.91   77      up
> 
> 34    hdd  10.91409   1.00000   11 TiB  6.6 TiB  6.6 TiB   44 MiB   15 GiB
> 4.3 TiB  60.87  0.93   81      up
> 
> 35    hdd  10.91409   1.00000   11 TiB  6.6 TiB  6.5 TiB   18 MiB   15 GiB
> 4.4 TiB  60.08  0.92   81      up
> 
> 38    hdd  12.73340   1.00000   13 TiB  8.4 TiB  8.4 TiB   18 MiB   19 GiB
> 4.3 TiB  66.25  1.02  105      up
> 
> 42    hdd  12.73340   1.00000   13 TiB  6.9 TiB  6.9 TiB   21 MiB   16 GiB
> 5.8 TiB  54.26  0.83   84      up
> 
> 45    hdd  12.73340   1.00000   13 TiB  7.7 TiB  7.7 TiB   38 MiB   18 GiB
> 5.0 TiB  60.61  0.93   94      up
> 
>                        TOTAL  582 TiB  380 TiB  379 TiB  942 MiB  950 GiB
> 203 TiB  65.20
> 
> 
> 
> 
> Thank you, 
> 
> Ricardo
> 
> 
> 
> 
> 
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