Re: pg_upgrade: can I use same binary for old & new?

pf@pfortin.com writes:
> On Sat, 5 Jul 2025 11:11:32 -0700 Adrian Klaver wrote:
>> How did you measure above?

> # du -sb /var/lib/pgsql/data
> 8227910662297   /var/lib/pgsql/data

It's likely that there's a deal of bloat in that.  Even if there's not
much bloat, this number will include indexes and WAL data that don't
appear in pg_dump output.

>> What was the pg_dump command?

> Didn't try given:
> $ df /mnt/db
> Filesystem      Size  Used Avail Use% Mounted on
> /dev/sdh1        17T   13T  3.0T  82% /mnt/db

I'd say give it a try; be sure to use one of the pg_dump modes
that compress the data.

            regards, tom lane