On Mon, 2023-02-27 at 18:18 +0100, Dávid Suchan wrote: > I did not use the -k --link argument while upgrading as that I presume does not copy the data It would be great if you shared the exact command line you used. The man page of "pg_upgradecluster" says: -m, --method=dump|upgrade|link|clone Specify the upgrade method. dump uses pg_dump(1) and pg_restore(1), upgrade uses pg_upgrade(1). The default is dump. Yours, Laurenz Albe