3 crush_tunables: firefly
5 - must scrub before tier agent can activate
9 - sudo ceph osd pool create base 4
10 - sudo ceph osd pool application enable base rados
11 - sudo ceph osd pool create cache 4
12 - sudo ceph osd tier add base cache
13 - sudo ceph osd tier cache-mode cache writeback
14 - sudo ceph osd tier set-overlay base cache
15 - sudo ceph osd pool set cache hit_set_type bloom
16 - sudo ceph osd pool set cache hit_set_count 8
17 - sudo ceph osd pool set cache hit_set_period 60
18 - sudo ceph osd pool set cache target_max_objects 250
19 - sudo ceph osd pool set cache min_read_recency_for_promote 2
20 - sudo ceph osd pool set cache min_write_recency_for_promote 2