Good day! I have server with Ubunu 14.04 and installed ceph firefly. Configured main_pool (2 osd) and ssd_pool (1 ssd osd). I want use ssd_pool as cache pool for main_pool ceph osd tier add main_pool ssd_pool ceph osd tier cache-mode ssd_pool writeback ceph osd tier set-overlay main_pool ssd_pool ceph osd pool set ssd_pool hit_set_type bloom ceph osd pool set ssd_pool hit_set_count 1 ceph osd pool set ssd_pool hit_set_period 600 ceph osd pool set ssd_pool target_max_bytes 100000000000 If use tgt as: tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 --bstype rbd --backing-store main_pool/store_main --bsopts "conf=/etc/ceph/ceph.conf" and then connected from iscsi initiator to this Lun1, i see that ssd_pool is used as cache (i see through iostat -x 1) but slow speed If use tgt as (or other sush as scst, iscsitarget): tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 -b /dev/rbd1 (where rbd1=main_pool/store_main) and then connected from iscsi initiator to this Lun1, i see that ssd_pool is not used, that write through to 2 osd Help me, anyone work this iscsi and cache pool?
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