Hello
After increasing number of PGs in a pool, ceph status is reporting
"Degraded data redundancy (low space): 1 pg backfill_toofull", but I
don't understand why, because all OSDs seem to have enough space.
ceph health detail says:
pg 40.155 is active+remapped+backfill_toofull, acting [20,57,79,85]
$ ceph pg map 40.155
osdmap e3952 pg 40.155 (40.155) -> up [20,57,66,85] acting [20,57,79,85]
So I guess Ceph wants to move 40.155 from 66 to 79 (or other way
around?). According to "osd df", OSD 66's utilization is 71.90%, OSD
79's utilization is 58.45%. The OSD with least free space in the cluster
is 81.23% full, and it's not any of the ones above.
OSD backfillfull_ratio is 90% (is there a better way to determine this?):
$ ceph osd dump | grep ratio
full_ratio 0.95
backfillfull_ratio 0.9
nearfull_ratio 0.7
Does anybody know why a PG could be in the backfill_toofull state if no
OSD is in the backfillfull state?
Vlad
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