> On Jan 11, 2024, at 8:29 PM, Andrew Wang <andrew.wang.2009@gmail.com> wrote:
>
> Thanks, now 3 versions, 14, 15, and 16 are running as shown below. I did pg_upgrade as detailed below, but it asked
meto shutdown postmaster, should which postmaster be down and how?
Both old and new, pg_upgrade will start the ones it needs when it needs them. Strongly suggest you review the
documentation,where this is clearly stated: https://www.postgresql.org/docs/current/pgupgrade.html