4 - but it is still running
5 - objects unfound and apparently lost
7 - \(CACHE_POOL_NEAR_FULL\)
8 - \(CACHE_POOL_NO_HIT_SET\)
12 - sudo ceph osd pool create cache 4
13 - sudo ceph osd tier add rbd cache
14 - sudo ceph osd tier cache-mode cache writeback
15 - sudo ceph osd tier set-overlay rbd cache
16 - sudo ceph osd pool set cache hit_set_type bloom
17 - sudo ceph osd pool set cache hit_set_count 8
18 - sudo ceph osd pool set cache hit_set_period 60
19 - sudo ceph osd pool set cache target_max_objects 250