My cluster (ceph pacific) is complaining about one of the OSD being 
backfillfull:

[WRN] OSD_BACKFILLFULL: 1 backfillfull osd(s)

    osd.31 is backfill full

backfillfull ratios:

full_ratio 0.95

backfillfull_ratio 0.9

nearfull_ratio 0.85

ceph osd df shows:

 31    hdd  5.55899   1.00000  5.6 TiB  3.8 TiB  3.7 TiB  411 MiB  6.7 GiB   
1.8 TiB  68.13  0.92   83      up

So, why does the cluster think that osd.31 is backfillfull if its only at 68% 
capacity?


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