So good news, I was not hit by the bug you mention on this thread.
What happened, (apparently, I did not tried to replicated it yet) is that I had another OSD (let call it OSD.1) using the db device, but that was part of an old spec. (let call it spec-a). And the OSD (OSD.2) I removed should be detected as part of spec-b. The difference between them was just the name and the placement, using labels instead of hostname.
When looking on the very verbous cephadm logs, it seemed that cephadm was just skipping my node, with a message saying that a node was already part of another spec.
I purged OSD.1 with --replace and --zap, and once disks where empty and ready to go, cephamd just added back OSD.1 and OSD.2 using the db_device as specified.
I do not know if this is the intended behavior, or if I was just lucky, but all my OSDs are back to the cluster.
Luis Domingues
Proton AG
------- Original Message -------
On Tuesday, July 18th, 2023 at 18:32, Luis Domingues <luis.domingues@xxxxxxxxx> wrote:
> That part looks quite good:
>
> "available": false,
> "ceph_device": true,
> "created": "2023-07-18T16:01:16.715487Z",
> "device_id": "SAMSUNG MZPLJ1T6HBJR-00007_S55JNG0R600354",
> "human_readable_type": "ssd",
> "lsm_data": {},
> "lvs": [
> {
> "cluster_fsid": "11b47c57-5e7f-44c0-8b19-ddd801a89435",
> "cluster_name": "ceph",
> "db_uuid": "CUMgp7-Uscn-ASLo-bh14-7Sxe-80GE-EcywDb",
> "name": "osd-block-db-5cb8edda-30f9-539f-b4c5-dbe420927911",
> "osd_fsid": "089894cf-1782-4a3a-8ac0-9dd043f80c71",
> "osd_id": "7",
> "osdspec_affinity": "",
> "type": "db"
> },
> {
>
> I forgot to mention that the cluster was initially deployed with ceph-ansible and adopted by cephadm.
>
> Luis Domingues
> Proton AG
>
>
>
>
> ------- Original Message -------
> On Tuesday, July 18th, 2023 at 18:15, Adam King adking@xxxxxxxxxx wrote:
>
>
>
> > in the "ceph orch device ls --format json-pretty" output, in the blob for
> > that specific device, is the "ceph_device" field set? There was a bug where
> > it wouldn't be set at all (https://tracker.ceph.com/issues/57100) and it
> > would make it so you couldn't use a device serving as a db device for any
> > further OSDs, unless the device was fully cleaned out (so it is no longer
> > serving as a db device). The "ceph_device" field is meant to be our way of
> > knowing "yes there are LVM partitions here, but they're our partitions for
> > ceph stuff, so we can still use the device" and without it (or with it just
> > being broken, as in the tracker) redeploying OSDs that used the device for
> > its DB wasn't working as we don't know if those LVs imply its our device or
> > has LVs for some other purpose. I had thought this was fixed already in
> > 16.2.13 but it sounds too similar to what you're seeing not to consider it.
> >
> > On Tue, Jul 18, 2023 at 10:53 AM Luis Domingues luis.domingues@xxxxxxxxx
> >
> > wrote:
> >
> > > Hi,
> > >
> > > We are running a ceph cluster managed with cephadm v16.2.13. Recently we
> > > needed to change a disk, and we replaced it with:
> > >
> > > ceph orch osd rm 37 --replace.
> > >
> > > It worked fine, the disk was drained and the OSD marked as destroy.
> > >
> > > However, after changing the disk, no OSD was created. Looking to the db
> > > device, the partition for db for OSD 37 was still there. So we destroyed it
> > > using:
> > > ceph-volume lvm zap --osd-id=37 --destroy.
> > >
> > > But we still have no OSD redeployed.
> > > Here we have our spec:
> > >
> > > ---
> > > service_type: osd
> > > service_id: osd-hdd
> > > placement:
> > > label: osds
> > > spec:
> > > data_devices:
> > > rotational: 1
> > > encrypted: true
> > > db_devices:
> > > size: '1TB:2TB' db_slots: 12
> > >
> > > And the disk looks good:
> > >
> > > HOST PATH TYPE DEVICE ID SIZE AVAILABLE REFRESHED REJECT REASONS
> > > node05 /dev/nvme2n1 ssd SAMSUNG MZPLJ1T6HBJR-00007_S55JNG0R600357 1600G
> > > 12m ago LVM detected, locked
> > >
> > > node05 /dev/sdk hdd SEAGATE_ST10000NM0206_ZA21G2170000C7240KPF 10.0T Yes
> > > 12m ago
> > >
> > > And VG on db_device looks to have enough space:
> > > ceph-33b06f1a-f6f6-57cf-9ca8-6e4aa81caae0 1 11 0 wz--n- <1.46t 173.91g
> > >
> > > If I remove the db_devices and db_slots from the specs, and do a dry run,
> > > the orchestrator seems to see the new disk as available:
> > >
> > > ceph orch apply -i osd_specs.yml --dry-run
> > > WARNING! Dry-Runs are snapshots of a certain point in time and are bound
> > > to the current inventory setup. If any of these conditions change, the
> > > preview will be invalid. Please make sure to have a minimal
> > > timeframe between planning and applying the specs.
> > > ####################
> > > SERVICESPEC PREVIEWS
> > > ####################
> > > +---------+------+--------+-------------+
> > > |SERVICE |NAME |ADD_TO |REMOVE_FROM |
> > > +---------+------+--------+-------------+
> > > +---------+------+--------+-------------+
> > > ################
> > > OSDSPEC PREVIEWS
> > > ################
> > > +---------+---------+-------------------------+----------+----+-----+
> > > |SERVICE |NAME |HOST |DATA |DB |WAL |
> > > +---------+---------+-------------------------+----------+----+-----+
> > > |osd |osd-hdd |node05 |/dev/sdk |- |- |
> > > +---------+---------+-------------------------+----------+----+-----+
> > >
> > > But as soon as I add db_devices back, the orchestrator is happy as it is,
> > > like there is nothing to do:
> > >
> > > ceph orch apply -i osd_specs.yml --dry-run
> > > WARNING! Dry-Runs are snapshots of a certain point in time and are bound
> > > to the current inventory setup. If any of these conditions change, the
> > > preview will be invalid. Please make sure to have a minimal
> > > timeframe between planning and applying the specs.
> > > ####################
> > > SERVICESPEC PREVIEWS
> > > ####################
> > > +---------+------+--------+-------------+
> > > |SERVICE |NAME |ADD_TO |REMOVE_FROM |
> > > +---------+------+--------+-------------+
> > > +---------+------+--------+-------------+
> > > ################
> > > OSDSPEC PREVIEWS
> > > ################
> > > +---------+------+------+------+----+-----+
> > > |SERVICE |NAME |HOST |DATA |DB |WAL |
> > > +---------+------+------+------+----+-----+
> > >
> > > I do not know why ceph will not use this disk, and I do not know where to
> > > look. It seems logs are not saying anything. And the weirdest thing,
> > > another disk was replaced on the same machine, and it went without any
> > > issues.
> > >
> > > Luis Domingues
> > > Proton AG
> > > _______________________________________________
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> >
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>
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