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this post was submitted on 23 Aug 2024
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I did something similar when migrating to 8. Consumer SSDs suck with proxmox so I bought 2 enterprise SSDs on Ebay before the migration and decided to do everything at once. I didn't have all the moving parts you did though. If you have an issue, you will more than likely not be able to pop back in the old SSDs and expect everything to work as normal. I'm not sure what you're using to create backups but if you're not already I would recommend PBS. This way if there is an issue, restoring your VMs is trivial. As long as that PBS is up and running correctly (makes sure to restore a backup before making any changes to make sure it works as intended) it should be ok. I have 2 PBS's. One on and off site.
PBS will keep the correct IPs of your VMs so reconnecting NFS shares shouldn't be an issue either.
I have a remote pbs but the backups aren't current because there was a connection error. I have Proxmox backups locally to a USB thumbdrive. That's what I was going to restore from.
I would say that is not the best way to keep/restore backups as you are missing the integrity checking features of a true backup system. But honestly what really matters is how important the data is to you.
When I say local I mean automated PVE backups the same as it would be through PBS. If that makes any difference.