Hi All

I’m planing to upgrade/migrate my dovecot cluster with two dovecot 2.2.36 nodes 
to 2.3.16.
They use Maildir als IMAP backend and will continue to use that in the future.

Can I just:
- Install a new Server (AlmaLinux 9)
- Stop dovecot on the old node-2
- Copy all the data from the old mail directory of node-2 to the new one
- Install dovecot 2.3 on the new on with more or less the same config and let 
it run
- Repeat the same with old node-1
?

Or would it be better to start of with an empty mail directory and let the 
other old node imapsync the data to the new one? - What would the advantage be 
(over the disadvantage that it may take some time to get everything synced)?

I know that Maildir are just static files, so moving them to the new server 
should not be a problem. I’m thinking more about indexes created by  dovecot 
2.2.36… Are they read without issues with the newever dovecot 2.3.16 or should 
I consider a re-index. or something the like?

thanks in advance,
Steven

-- 
https://steven.varco.ch/ 
https://www.tech-island.com/ 

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