4 - sudo ceph osd pool create cache 4
5 - sudo ceph osd tier add rbd cache
6 - sudo ceph osd tier cache-mode cache writeback
7 - sudo ceph osd tier set-overlay rbd cache
8 - sudo ceph osd pool set cache hit_set_type bloom
9 - sudo ceph osd pool set cache hit_set_count 8
10 - sudo ceph osd pool set cache hit_set_period 60
11 - sudo ceph osd pool set cache target_max_objects 250