Date: Wed, 24 Mar 2021 10:11:04 -0300
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Erik Serrano <eserranos@gmail.com>
Cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>
Subject: Re: Upgrade from 9.2 to 9.6 without space
Message-ID: <20210324131104.GA7965@alvherre.pgsql>
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Hello Erik

On 2021-Mar-24, Erik Serrano wrote:

> I am writing why I need guidance regarding a version upgrade in Postgresql.
> I have a server with 85% of the disk occupied only in the / var / lib /
> pgsql / data folder and when doing an upgrade it drops because it does not
> have space to create the new / var / lib / pgsql folder /9.6/data in your
> process.
> So I need to know if there is any procedure to upgrade without making a
> copy since I do not have space for another folder of the same size.

pg_upgrade can do that if you use link mode (pg_upgrade -k).  It is
strongly recommended to make a snapshot of the data directory before the
upgrade, so that you can roll back to the original if things go wrong.

Going up only to 9.6 means that you will be pressed to move to a more
recent version soon, since 9.6 goes out of support at the end of the
year.  Why not go straight to, say, 12?

I suggest to add more storage space.

The pgsql-es-ayuda@lists.postgresql.org can help you if you would like
to discuss in Spanish.

-- 
Álvaro Herrera                            39°49'30"S 73°17'W