On Tue, 14 Jun 2022, Guillaume Pavese wrote:

Not sure about recovering your cluster on a 4.5 install with a 4.4 backup. I
would also like to know if that is possible.

It's definitely possible. I had an issue with my 4.4->4.5 upgrade (always make a backup first) and wanted to switch my engine from CentOS Stream to Rocky anyway, so I built a new host and installed 4.5 using my backup from 4.4.10.

With 4.3->4.4 this was the only way to upgrade due to the OS version change. 4.3 requires el7, 4.4 requires el8, and there is no in-place el7->el8 upgrade (except maybe for very specific versions of RHEL). So you had to make a backup on 4.3, reinstall your engine host with el8, then restore the backup on 4.4. Plus a few extra steps if using the self-hosted engine...
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