Migration from 8 to 9 with fresh install

Oct 14, 2024
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Hello Everyone,

We have 3 node cluster with ceph 18 with 2 osds per host.
OS is running on mirrored 2TB nvmes which are mostly unused.
Now, i had a thought that we could utilize those nvmes in the ceph pool for db/wal but i really dont want to deal with the zfs shrinking.
So, with the version 9 coming out Im thinking about reinstalling all the nodes 1by1 while keeping everything running on the 2 spare nodes.

What are some things I should be on the lookout for? I read the upgrade wiki page, so ceph will be going 19 before starting any other work.
Will it be possible to rebuild the cluster with one v9 node and 2 v8?
Any other things i should be on lookout for?

Thanks