5 - \(CACHE_POOL_NEAR_FULL\)
6 - \(CACHE_POOL_NO_HIT_SET\)
10 - sudo ceph osd pool create cache 4
11 - sudo ceph osd tier add rbd cache
12 - sudo ceph osd tier cache-mode cache writeback
13 - sudo ceph osd tier set-overlay rbd cache
14 - sudo ceph osd pool set cache hit_set_type bloom
15 - sudo ceph osd pool set cache hit_set_count 8
16 - sudo ceph osd pool set cache hit_set_period 60
17 - sudo ceph osd pool set cache target_max_objects 250