Hallo folks,
i am encountering a weird behavior from Ceph when i try to remove an OSD
to replace it with an encrypted one. Where the OSD is being directly
recreated with an additional block device after removal.
So, the idea is to remove an OSD which was created without encryption
enabled and re-create another encrapted one.
My idea was to process this way
1- I am setting noout first on the osd :
`ceph osd add-noout osd.9`
2- removing the osd from crush with replace flag in-order to retain the
id 22 :
`ceph orch osd rm 9 --replace --force`
3- checking if it's safe to destroy:
`ceph osd safe-to-destroy osd.9`
4- zap the lvm partitions
`cephadm shell ceph-volume lvm zap --destroy --osd-id 9`
5- re-apply the osd service spec with encryption enabled
6- unset noout
But after removing the osd in step 2 the OSD is being direktly recreated
and when i list logical volumes and devices i can see that the osd now
has two block devices
```
====== osd.9 =======
[block]
/dev/ceph-0074651e-25fa-462d-af82-44ea7e0c7866/osd-block-fe12826f-f3e4-4106-b323-1e880471b243
block device
/dev/ceph-0074651e-25fa-462d-af82-44ea7e0c7866/osd-block-fe12826f-f3e4-4106-b323-1e880471b243
block uuid 9UBLAv-giHf-pGUy-Ir5f-XQSe-nIjE-X7vkTP
cephx lockbox secret AQDie5hj/QS/IBAA/Fpb9TfqZJSiRUG7haxRUw==
cluster fsid 42c6ceac-d549-11ec-9db5-b549f63e669c
cluster name ceph
crush device class
encrypted 1
osd fsid fe12826f-f3e4-4106-b323-1e880471b243
osd id 9
osdspec affinity osd_spec_nvme
type block
vdo 0
devices /dev/sde
[block]
/dev/ceph-38f39e5e-3cb2-4a38-8cea-84a91bb5b755/osd-block-adf2c0a6-3912-4eea-b094-7a39f010b25d
block device
/dev/ceph-38f39e5e-3cb2-4a38-8cea-84a91bb5b755/osd-block-adf2c0a6-3912-4eea-b094-7a39f010b25d
block uuid A4tFzY-jxbM-gHvd-eTfI-14Lh-YTK8-Pm1YEA
cephx lockbox secret
cluster fsid 42c6ceac-d549-11ec-9db5-b549f63e669c
cluster name ceph
crush device class
db device
/dev/ceph-ee8df5e7-ee7a-4ee7-acd9-a8fef79893b5/osd-db-39ddd23c-94bb-4c50-a326-0798265fb696
db uuid DlWk5x-EQQD-EZlP-GH56-T7Ea-3Y1x-Lqkr2x
encrypted 0
osd fsid adf2c0a6-3912-4eea-b094-7a39f010b25d
osd id 9
osdspec affinity osd_spec_nvme
type block
vdo 0
devices /dev/sdi
[db]
/dev/ceph-ee8df5e7-ee7a-4ee7-acd9-a8fef79893b5/osd-db-39ddd23c-94bb-4c50-a326-0798265fb696
block device
/dev/ceph-38f39e5e-3cb2-4a38-8cea-84a91bb5b755/osd-block-adf2c0a6-3912-4eea-b094-7a39f010b25d
block uuid A4tFzY-jxbM-gHvd-eTfI-14Lh-YTK8-Pm1YEA
cephx lockbox secret
cluster fsid 42c6ceac-d549-11ec-9db5-b549f63e669c
cluster name ceph
crush device class
db device
/dev/ceph-ee8df5e7-ee7a-4ee7-acd9-a8fef79893b5/osd-db-39ddd23c-94bb-4c50-a326-0798265fb696
db uuid DlWk5x-EQQD-EZlP-GH56-T7Ea-3Y1x-Lqkr2x
encrypted 0
osd fsid adf2c0a6-3912-4eea-b094-7a39f010b25d
osd id 9
osdspec affinity osd_spec_nvme
type db
vdo 0
devices /dev/nvme0n1
```
I am unable to explain this behavior! How can i stop cephadm from
recreating the osd. I thought that setting the noout would be sufficient.
I am running Ceph quincy version 17.2.0
Best regards,
Ali Akil
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