I used the approach recommended by Eugen a few months ago and it worked well. I made a small change to the lv names, instead of osd.0 in # Create Logical Volume ceph:~ # lvcreate -L 5G -n ceph-osd0-db ceph-db I used ceph:~ # lvcreate -L 5G -n ceph-db-${OSD_FSID} ceph-db where ${OSD_FSID} is the following # Get the OSD's FSID [ceph: root@ceph /]# OSD_FSID=$(ceph-volume lvm list 0 | awk '/osd fsid/ {print $3}') fb69ba54-4d56-4c90-a855-6b350d186df5 On Thu, Feb 19, 2026 at 8:35 PM Eugen Block via ceph-users < ceph-users@ceph.io> wrote:

Maybe this helps:

https://heiterbiswolkig.blogs.nde.ag/2025/02/05/cephadm-migrate-db-wal-to-ne...

Note that cephadm shell is always executed locally on the host, not remotely, there’s no ‚--host‘ parameter.

Zitat von Steven Vacaroaia via ceph-users <ceph-users@ceph.io>:

...

Hi,

I have a 7 nodes cluster deployed using cephadm with a mixt of HDD, SSD and NVME

I would like to reconfigure some of the HDD OSDs and put their DB on NVME There are only 6 x18 TB OSDs and there is a dedicate , "empty" 1.6 TB NVME installed for this purpose

The cluster is configured as EC 4+2 and is not under heavy use

I would appreciate if you could advise what is the best way of achieving that

As far as I was able to find, there are these 2 options

1. remove and redeploy OSDs 2. use ceph-volume

Option 1 is pretty straight forward but more time consuming

For Option2 though I was not able to find any clear instructions

The first thing I stumbled one was how to use ceph-volume in a cephadm managed cluster on a host that does not have it

( "cephadm shell --host HOSTNAME -- ceph-volume ls" is complaining about "unrecognized arguments --host")

Any help,links,suggestions will be greatly appreciated

Steven _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io

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