I'm not sure why it fails, but it seems like you deviate a bit from
the instructions. If you want to migrate the db to a new device, you
need to specify an existing VG and LV, in this case it is not created
for you.
And I'm not really sure why you run 'ceph-volume lvm activate --all
--no-systemd', that's not necessary. So I'll try to provide a complete
list of steps, hopefully that works for you as it does for me:
1. soc9-ceph:~ # vgcreate ceph-db /dev/vdf
2. soc9-ceph:~ # lvcreate -L 5G -n ceph-osd0-db ceph-db (mind the LV
size, just a test cluster here)
3. soc9-ceph:~ # ceph orch daemon stop osd.0
4. soc9-ceph:~ # cephadm shell --name osd.0
5. [ceph: root@soc9-ceph /]# ceph-volume lvm new-db --osd-id 0
--osd-fsid fb69ba54-4d56-4c90-a855-6b350d186df5 --target
ceph-db/ceph-osd0-db
6. [ceph: root@soc9-ceph /]# ceph-volume lvm migrate --osd-id 0
--osd-fsid fb69ba54-4d56-4c90-a855-6b350d186df5 --from
/var/lib/ceph/osd/ceph-0/block --target ceph-db/ceph-osd0-db
7. Exit shell
8. soc9-ceph:~ # ceph orch daemon start osd.0
9. Verify db config: soc9-ceph:~ # ceph tell osd.0 perf dump bluefs |
jq -r '.[].db_total_bytes,.[].db_used_bytes'
5368700928
47185920
So as you see, the OSD has picked up the new db device and uses 47 MB
(it's an empty test cluster). Also note that this is a single-node
cluster, so the orchestrator commands and shell commands are all
executed on the same host.
Let me know how it goes.
Zitat von Alan Murrell <Alan@xxxxxxxx>:
Ok, just gave it a try and I am still running into an error. Here
is exactly what I did:
I logged on to my host where osd.10 is
Deleted my current VG and LV's on my NVME that will hold the WAL/DB,
as I kind of liked what you used. My VG is called "cephdb03" and my
LVs are called "ceph-osd-dbX", where "X" is 1 through 4.
Ran the command to stop osd.10 service:
systemctl stop ceph-474264fe-b00e-11ee-b586-ac1f6b0ff21a@osd.10
connected to the general cephadm shell and ran:
ceph-volume lvm activate --all --no-systemd
Exited the general shel and entered the container for OSD 10:
cephadm shell name osd.10
Ran the ceph-volume command to create the new DB on cephdb03/ceph-osd-db1 :
ceph-volume lvm new-db --osd-id 10 --osd-fsid
474264fe-b00e-11ee-b586-ac1f6b0ff21a --target cephdb03/ceph-osd-db1
Got the following error:
--> Unable to find any LV for source OSD: id:10
fsid:474264fe-b00e-11ee-b586-ac1f6b0ff21a
Unexpected error, terminating
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