Hello! I'am looking for method to make rgw ssd-cache tier with hdd
https://blog-fromsomedude.rhcloud.com/2015/11/06/Ceph-RadosGW-Placement-Targets/ I successfully created rgw pools for ssd as described above And Placement Targets are written to users profile So data can be written to any hdd or ssd pool "placement_targets": [ { "name": "default-placement", "tags": ["default-placement"] }, { "name": "fast-placement", "tags": ["fast-placement"] } ], "default_placement": "default-placement", "placement_pools": [ { "key": "default-placement", "val": { "index_pool": "default.rgw.buckets.index", "data_pool": "default.rgw.buckets.data", "data_extra_pool": "default.rgw.buckets.non-ec", "index_type": 0 } }, { "key": "fast-placement", "val": { "index_pool": "default.rgw.fast.buckets.index", "data_pool": "default.rgw.fast.buckets.data", "data_extra_pool": "default.rgw.fast.buckets.non-ec", "index_type": 0 } "keys": [ { "user": "test2", "default_placement": "fast-placement", "placement_tags": ["default-placement", "fast-placement"], NAME ID USED %USED MAX AVAIL OBJECTS default.rgw.fast.buckets.data 16 2906M 0.13 2216G 4339 default.rgw.buckets.data 18 20451M 0.12 16689G 6944 Then I make tier: ceph osd tier add default.rgw.buckets.data default.rgw.fast.buckets.data --force-nonempty ceph osd tier cache-mode default.rgw.fast.buckets.data writeback ceph osd tier set-overlay default.rgw.buckets.data default.rgw.fast.buckets.data ceph osd pool set default.rgw.fast.buckets.data hit_set_type bloom ceph osd pool set default.rgw.fast.buckets.data hit_set_count 1 ceph osd pool set default.rgw.fast.buckets.data hit_set_period 300 ceph osd pool set default.rgw.fast.buckets.data target_max_bytes 2200000000000 ceph osd pool set default.rgw.fast.buckets.data cache_min_flush_age 300 ceph osd pool set default.rgw.fast.buckets.data cache_min_evict_age 300 ceph osd pool set default.rgw.fast.buckets.data cache_target_dirty_ratio 0.01 ceph osd pool set default.rgw.fast.buckets.data cache_target_full_ratio 0.02 Put in some data, it felt down to ssd-cache and lower to hdd-pool. Cluster has no active clients that could keep warm data. But after 300 seconds no flushing/evicting. Only direct command works: rados -p default.rgw.fast.buckets.data cache-flush-evict-all How to fix? (Jewel version 10.2.5) -- Petr Malkov
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