Just upgraded from PostgreSQL 13 to 15 and the process was so smooth that at first I worried nothing had happened. But turns out PostgreSQL is just that good. Deeply impressed.
@bert_hubert I did it some months ago. I would just have prefered to be able to do it with read-only old-data and old-binaries directories. It would have allowed me to do it directly from a ZFS snapshot made juste before upgrade
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