Hi,
while in fact the db+wal LV/PV/VG is on a _partition_ of that
device, nvme1n1p4.
the metadata.devices only contains the main device, not the partition.
which worked. Can ceph-volume zap be used for this as well?
Usually, I use 'ceph-volume lvm zap --destroy...', have you tried it
with the keyword 'lvm' as well?
I decided to write a short blog post [0] to describe both migrating to
a new DB device and back from DB to the main device.
[0]
https://heiterbiswolkig.blogs.nde.ag/2025/02/05/cephadm-migrate-db-wal-to-new-device/
Zitat von Jan Kasprzak <kas@xxxxxxxxxx>:
Holger, Eugen,
thanks! I tried the ceph-volume approach, and it worked.
The only strange thing was that "ceph osd metadata $ID | grep devices"
reports
"bluefs_db_devices": "nvme1n1",
while in fact the db+wal LV/PV/VG is on a _partition_ of that
device, nvme1n1p4.
Another problem is how to remove the volume group on that device.
I expected "ceph-volume zap /dev/nvme1n1p4" to be able to do it,
but it failed with:
stderr: wipefs: error: /dev/nvme1n1p4: probing initialization
failed: Device or resource busy
--> failed to wipefs device, will try again to workaround probable
race condition
In the end I did
osd# vgchange -a n ceph-1cbc1f4d-9043-4a10-844b-c7fe28b4a333
osd# vgremove ceph-1cbc1f4d-9043-4a10-844b-c7fe28b4a333
which worked. Can ceph-volume zap be used for this as well?
FWIW, all the commands I did:
mon# ceph osd metadata 8 | grep devices
"bluefs_db_devices": "nvme1n1",
"bluestore_bdev_devices": "sda",
"devices": "nvme1n1,sda",
"objectstore_numa_unknown_devices": "sda",
mon# ceph osd set noout
osd# ls -l /var/lib/ceph/osd/ceph-8
lrwxrwxrwx. 1 ceph ceph 93 Feb 3 22:11 block ->
/dev/ceph-179dc46e-f620-4b54-b663-24e5be779b3b/osd-block-d38e32da-fc81-4744-ad3a-750ba2cf3bc6
lrwxrwxrwx. 1 ceph ceph 90 Feb 3 22:11 block.db ->
/dev/ceph-1cbc1f4d-9043-4a10-844b-c7fe28b4a333/osd-db-ce2a1653-3cf3-4eac-b74c-3d49bb4ef170
osd# systemctl stop ceph-osd@8.service
osd# ceph-volume lvm migrate --osd-id 8 --osd-fsid
d38e32da-fc81-4744-ad3a-750
osd# ba2cf3bc6 --from db wal --target
ceph-179dc46e-f620-4b54-b663-24e5be779b3b/osd-block-d38e32da-fc81-4744-ad3a-750ba2cf3bc6
osd# vgchange -a n ceph-1cbc1f4d-9043-4a10-844b-c7fe28b4a333
osd# vgremove ceph-1cbc1f4d-9043-4a10-844b-c7fe28b4a333
osd# systemctl start ceph-osd@8.service
mon# ceph osd unset noout
mon# watch ceph -s # till it reports HEALTH_OK
Thanks,
-Yenya
--
| Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> |
| https://www.fi.muni.cz/~kas/ GPG: 4096R/A45477D5 |
We all agree on the necessity of compromise. We just can't agree on
when it's necessary to compromise. --Larry Wall
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