29 Jun
2020
29 Jun
'20
3:37 p.m.
Nautilus - Bluestore OSD's created with everything on disk. Now I have
some spare SSD's - can I move the location of the existing WAL and/or DB
to SSD partitions without recreating the OSD?
I suspect not - saw emails from 2018, in the negative :(
Failing that - is it difficult to add lvmcache to a osd?
--
Lindsay
29 Jun
29 Jun
3:44 p.m.
Hi Lindays,
Am 29.06.20 um 15:37 schrieb Lindsay Mathieson:
Nautilus - Bluestore OSD's created with everything
on disk. Now I have
some spare SSD's - can I move the location of the existing WAL and/or DB
to SSD partitions without recreating the OSD?
I suspect not - saw emails from 2018, in the negative :(
Yes you can.
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
>
> Failing that - is it difficult to add lvmcache to a osd?
>
>
>
>
4:11 p.m.
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
30 Jun
30 Jun
12:17 p.m.
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@ceph.io/thread/6OHVTNXH5SL…
[2] https://tracker.ceph.com/issues/42928
Zitat von Lindsay Mathieson <lindsay.mathieson(a)gmail.com>om>:
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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12:47 p.m.
On 30/06/2020 8:17 pm, Eugen Block wrote:
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@ceph.io/thread/6OHVTNXH5SL…
[2] https://tracker.ceph.com/issues/42928
Thanks and *ouch* - thats a lot of manual tweaking with things I don't
really understand if stuff goes wrong and is still in testing/experimental?
I might just setting for slowly recreating the OSD's - seems safer. Its
not like I'm in a hurry or will be traveling anywhere soon :)
Thanks!
--
Lindsay
1390
days inactive
1391
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4 comments
3 participants
participants (3)
-
Eugen Block -
Lindsay Mathieson -
Stefan Priebe - Profihost AG