[ceph-users] Re: db_devices doesn't show up in exported osd service spec

4 Feb 2021

      Hi.

I have the same situation. Running 15.2.8
I created a specification that looked just like it. With rotational in the data and non-rotational in the db.

First use applied fine. Afterwards it only uses the hdd, and not the ssd.
Also, is there a way to remove an unused osd service.
I manages to create osd.all-available-devices, when I tried to stop the autocreation of OSD's. Using ceph orch apply osd --all-available-devices --unmanaged=true

I created the original OSD using the web interface.

Regards

Jens
-----Original Message-----
From: Eugen Block <eblock@nde.ag> 
Sent: 3. februar 2021 11:40
To: Tony Liu <tonyliu0592@hotmail.com>
Cc: ceph-users@ceph.io
Subject: [ceph-users] Re: db_devices doesn't show up in exported osd service spec

How do you manage the db_sizes of your SSDs? Is that managed automatically by ceph-volume? You could try to add another config and see what it does, maybe try to add block_db_size?

Zitat von Tony Liu <tonyliu0592@hotmail.com>:
...
All mon, mgr, crash and osd are upgraded to 15.2.8. It actually fixed 
another issue (no device listed after adding host).
But this issue remains.
```
# cat osd-spec.yaml
service_type: osd
service_id: osd-spec
placement:
  host_pattern: ceph-osd-[1-3]
data_devices:
  rotational: 1
db_devices:
  rotational: 0
# ceph orch apply osd -i osd-spec.yaml Scheduled osd.osd-spec 
update...
# ceph orch ls --service_name osd.osd-spec --export
service_type: osd
service_id: osd-spec
service_name: osd.osd-spec
placement:
  host_pattern: ceph-osd-[1-3]
spec:
  data_devices:
    rotational: 1
  filter_logic: AND
  objectstore: bluestore
```
db_devices still doesn't show up.
Keep scratching my head...
Thanks!
Tony
...
-----Original Message-----
From: Eugen Block <eblock@nde.ag>
Sent: Tuesday, February 2, 2021 2:20 AM
To: ceph-users@ceph.io
Subject: [ceph-users] Re: db_devices doesn't show up in exported osd 
service spec
Hi,
I would recommend to update (again), here's my output from a 15.2.8 
test
cluster:
host1:~ # ceph orch ls --service_name osd.default --export
service_type: osd
service_id: default
service_name: osd.default
placement:
   hosts:
   - host4
   - host3
   - host1
   - host2
spec:
   block_db_size: 4G
   data_devices:
     rotational: 1
     size: '20G:'
   db_devices:
     size: '10G:'
   filter_logic: AND
   objectstore: bluestore
Regards,
Eugen
Zitat von Tony Liu <tonyliu0592@hotmail.com>:
...
Hi,
When build cluster Octopus 15.2.5 initially, here is the OSD 
service spec file applied.
```
service_type: osd
service_id: osd-spec
placement:
  host_pattern: ceph-osd-[1-3]
data_devices:
  rotational: 1
db_devices:
  rotational: 0
```
After applying it, all HDDs were added and DB of each hdd is 
created on SSD.
Here is the export of OSD service spec.
```
# ceph orch ls --service_name osd.osd-spec --export
service_type: osd
service_id: osd-spec
service_name: osd.osd-spec
placement:
  host_pattern: ceph-osd-[1-3]
spec:
  data_devices:
    rotational: 1
  filter_logic: AND
  objectstore: bluestore
```
Why db_devices doesn't show up there?
When I replace a disk recently, when the new disk was installed and 
zapped, OSD was automatically re-created, but DB was created on 
HDD, not SSD. I assume this is because of that missing db_devices?
I tried to update service spec, the same result, db_devices doesn't 
show up when export it.
Is this some known issue or something I am missing?
Thanks!
Tony
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[ceph-users] Re: db_devices doesn't show up in exported osd service spec

Jens Hyllegaard (Soft Design A/S)