Don't forget to set the correct LV tags for the new db device as
mentioned in [1] and [2].
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/6OHVTNXH5SLI4ABC75VVP7J2DT7X4FZA/
[2] https://tracker.ceph.com/issues/42928
Zitat von Lindsay Mathieson <lindsay.mathieson@xxxxxxxxx>:
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
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