On 11/09/2020 16:11, Shain Miley wrote:
Hello,
I have been wondering for quite some time whether or not it is possible to influence the osd.id numbers that are assigned during an install.
I have made an attempt to keep our osds in order over the last few years, but it is a losing battle without having some control over the osd assignment.
I am currently using ceph-deploy to handle adding nodes to the cluster.
You can reuse osd numbers, but I strongly advice you not to focus on
precise IDs. The reason is that you can have such combination of server
faults, which will swap IDs no matter what.
It's a false sense of beauty to have 'ID of OSD match ID in the name of
the server'.
How to reuse osd nums?
OSD number is used (and should be cleaned if OSD dies) in three places
in Ceph:
1) Crush map: ceph osd crush rm osd.x
2) osd list: ceph osd rm osd.x
3) auth: ceph auth rm osd.x
The last one is often forgoten and is a usual reason for ceph-ansible to
fail on new disk in the server.
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