Hey all, I'm trying to figure out the appropriate process for adding a separate SSD block.db to an existing OSD. From what I gather the two steps are: 1. Use ceph-bluestore-tool bluefs-bdev-new-db to add the new db device 2. Migrate the data ceph-bluestore-tool bluefs-bdev-migrate I followed this and got both executed fine without any error. Yet when the OSD got started up, it keeps on using the integrated block.db instead of the new db. The block.db link to the new db device was deleted. Again, no error, just not using the new db Any suggestion? Thanks. --Tri Hoang root@elmo:/#CEPH_ARGS="--bluestore_block_db_size=26843545600 --bluestore_block_db_create=true" ceph-bluestore-tool --path /mnt/ceph/c258000c-f3e4-11ea-9ebe-c3c75e8e9028/osd.2 bluefs-bdev-new-db --dev-target /dev/vg/sdc.db inferring bluefs devices from bluestore path DB device added /dev/dm-8 root@elmo:/# ceph-bluestore-tool --path /mnt/ceph/c258000c-f3e4-11ea-9ebe-c3c75e8e9028/osd.2 --devs-source /mnt/ceph/c258000c-f3e4-11ea-9ebe-c3c75e8e9028/osd.2/block --dev-target /mnt/ceph/c258000c-f3e4-11ea-9ebe-c3c75e8e9028/osd.2/block.db bluefs-bdev-migrate inferring bluefs devices from bluestore path