Hi all, We have a erasure coded pool 'ecdata' and a replicated pool 'cache' acting as writeback cache upon it. When running 'rados -p ecdata bench 1000 write', it starts filling up the 'cache' pool as expected. I want to see what happens when it starts evicting, therefore I've done: ceph osd pool set cache target_max_bytes $((200*1024*1024*1024)) When it start to evict the objects to 'ecdata', the cache osds are all crashing. I logged an issue : http://tracker.ceph.com/issues/8982 I enabled the cache with this commands: ceph osd pool create cache 1024 1024 ceph osd erasure-code-profile set profile11 k=8 m=3 ruleset-failure-domain=osd ceph osd pool create ecdata 128 128 erasure profile11 ceph osd tier add ecdata cache ceph osd tier cache-mode cache writeback ceph osd tier set-overlay ecdata cache Is there something else that I should configure? Thanks! Kenneth
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