Hi,


i have build a cach-tier pool (replica 2) with 3 x 512gb ssd for my kvm pool.

these are my settings :



ceph osd tier add kvm cache-pool

ceph osd tier cache-mode cache-pool writeback

ceph osd tier set-overlay kvm cache-pool



ceph osd pool set cache-pool hit_set_type bloom

ceph osd pool set cache-pool hit_set_count 1

ceph osd pool set cache-pool hit set period 3600



ceph osd pool set cache-pool target_max_bytes 751619276800

ceph osd pool set cache-pool target_max_objects 1000000



ceph osd pool set cache-pool cache_min_flush_age 1800

ceph osd pool set cache-pool cache_min_evict_age 600



ceph osd pool cache-pool cache_target_dirty_ratio .4

ceph osd pool cache-pool cache target_full_ratio .8



So the problem is, the cache-tier do no evict automatically.

If i copy some kvm images to the ceph cluster, the cache osds always run full.



Is that normal?

Is there a miss configuration?



thanks

best regards

Patrik











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