backfillfull osd - but it is only at 68% capacity

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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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