5 - wrongly marked me down
6 - objects unfound and apparently lost
13 - sudo ceph osd pool create base 4
14 - sudo ceph osd pool create cache 4
15 - sudo ceph osd tier add base cache
16 - sudo ceph osd tier cache-mode cache writeback
17 - sudo ceph osd tier set-overlay base cache
18 - sudo ceph osd pool set cache hit_set_type bloom
19 - sudo ceph osd pool set cache hit_set_count 8
20 - sudo ceph osd pool set cache hit_set_period 3600
21 - sudo ceph osd pool set cache target_max_objects 250