I tried this in my lab again with Nautilus and it worked as expected,
I could start the new OSD immediately. I'll try with Octopus tomorrow
again.
Zitat von "Szabo, Istvan (Agoda)" <[email protected]>:
Gave a try of it, so all the 3 osds finally failed :/ Not sure what
went wrong.
Do the normal maintenance things, ceph osd set noout, ceph osd set
norebalance, stop the osd and run this command:
ceph-bluestore-tool bluefs-bdev-migrate --dev-target
/var/lib/ceph/osd/ceph-0/block --devs-source
/var/lib/ceph/osd/ceph-8/block.db --path /var/lib/ceph/osd/ceph-8/
Output:
device removed:1 /var/lib/ceph/osd/ceph-8/block.db
device added: 1 /dev/dm-2
When tried to start I got this in the log:
osd.8 0 OSD:init: unable to mount object store
** ERROR: osd init failed: (13) Permission denied
set uid:gid to 167:167 (ceph:ceph)
ceph version 15.2.13 (c44bc49e7a57a87d84dfff2a077a2058aa2172e2)
octopus (stable), process ceph-osd, pid 1512261
pidfile_write: ignore empty --pid-file
From the another 2 osds the block.db removed and I can start it back.
I've zapped the db drive just to be removed from the device
completely and after machine restart none of these 2 osds came back,
I guess missing the db device.
Is there any steps missing?
1.Noout+norebalance
2. Stop osd
3. migrate with the above command the block.db to the block.
4. do on the other osds which is sharing the same db device that
want to remove.
5. zap the db device
6. start back the osds.
Istvan Szabo
Senior Infrastructure Engineer
---------------------------------------------------
Agoda Services Co., Ltd.
e: [email protected]
---------------------------------------------------
-----Original Message-----
From: Eugen Block <[email protected]>
Sent: Monday, September 27, 2021 7:42 PM
To: [email protected]
Subject: [ceph-users] Re: is it possible to remove the db+wal from
an external device (nvme)
Email received from the internet. If in doubt, don't click any link
nor open any attachment !
________________________________
Hi,
I think 'ceph-bluestore-tool bluefs-bdev-migrate' could be of use
here. I haven't tried it in a production environment yet, only in
virtual labs.
Regards,
Eugen
Zitat von "Szabo, Istvan (Agoda)" <[email protected]>:
Hi,
Seems like in our config the nvme device as a wal+db in front of the
ssd slowing down the ssds osds.
I'd like to avoid to rebuild all the osd-, is there a way somehow
migrate to the "slower device" the wal+db without reinstall?
Ty
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