Do I still have to stop the osd.X systemctl service on the host before running the commands, like in that article I linked, or is that unnecessary?
-----Original Message-----
From: Eugen Block <eblock@xxxxxx>
Sent: February 2, 2025 23:45
To: ceph-users@xxxxxxx
Subject: Re: cephadm: Move DB/WAL from HDD to SSD
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Hi,
> When you ran the ceph-volume command, did you do it within the
> container of the OSD? Running it with the container of the OSD would
> make sense as to why I was getting the errors I was getting.
yes, I ran the commands within the OSD container. Don't forget to run the "migrate" command as well after you created a new db.
Just one more remark about your followup question in the initial post:
> Followup question: if I do seem to have to go the route of destroying
> the OSD and
re-creating it with the flags for point the DB/WAL to the SSD partition, the syntax I have seen is this:
> ceph-volume lvm prepare --bluestore --block.db --block.wal --data
VOLUME_GROUP/LOGICAL_VOLUME
Beside the fact that you assume correctly and the command lacks the db/wal device specification, I strongly recommend to let cephadm handle the entire process of OSD creation, just ensure you have a fitting spec file. Don't prepare any LVs manually beforehand, except for such a case as right now where you want to move DBs out of the main device. But if you want to create OSDs from scratch, use the orchestrator, it does all of the work. And don't forget the --dry-run flag if you want to apply a new spec (ceph orch apply -i osd-spec.yaml --dry-run).
Regards,
Eugen
Zitat von Alan Murrell <Alan@xxxxxxxx>:
> Hello,
>
> I ran the commands from the "regular" cephadm shell ('cephadm shell
> --') but did not specify an OSD (I wasn't aware you could do that)
>
> When you ran the ceph-volume command, did you do it within the
> container of the OSD? Running it with the container of the OSD would
> make sense as to why I was getting the errors I was getting.
>
> I can give it a try and let you know how it goes, and if necessary go
> from there.
>
>
>
> Sent from my mobile device. Please excuse brevity and ttpos.
>
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