[ceph-users] Re: Move WAL/DB to SSD for existing OSD?

On 29/06/2020 11:44 pm, Stefan Priebe - Profihost AG wrote:

You need to use: ceph-bluestore-tool --path /var/lib/ceph/osd/ceph-${OSD} bluefs-bdev-new-db --dev-target /dev/bluesfs_db/db-osd${OSD}

and

ceph-bluestore-tool --path dev/osd1/ --devs-source dev/osd1/block --dev-target dev/osd1/block.db bluefs-bdev-migrate

those are not tested and just what i remembered but it should point you in the richt direction.

greets, Stefan

Thanks Stephan, thats great. Best I test with a single OSD first :) I presume it needs to be down for this. Going to have to wait a bit while the cluster rebalances after a pg reduction though. Might start a separate thread on lvmcache versus WAL/DB on SSD for VM usage, if that hasn't been done to death... -- Lindsay