Re: Guidance Needed for PostgreSQL Upgrade from 12 to 15 - Mailing list pgsql-admin

> On Nov 19, 2024, at 1:40 PM, Kris Deugau <kdeugau@vianet.ca> wrote:
>
> I stand corrected.  I hadn't read the docs on pg_upgrade for quite a while, but after reading the last section in
https://www.postgresql.org/docs/current/pgupgrade.html:
>
> "If you did not start the new cluster, the old cluster was unmodified except that, when linking started, a .old
suffixwas appended to $PGDATA/global/pg_control. To reuse the old cluster, remove the .old suffix from
$PGDATA/global/pg_control;you can then restart the old cluster." 
>
> I see what you mean.
>

There's nothing wrong per se about taking the snapshot before, I was just saving the potential time of re-running
pg_upgrade.Heck, take a snapshot before *and* after ;-)