=?utf-8?q?PG_Bug_reporting_form?= <noreply@postgresql.org> writes:
> 2018-05-28T10:08:38.487348231Z 2018-05-28 10:08:38.487 UTC [110] DETAIL:
> Could not open file "pg_subtrans/0013": Invalid argument.
EINVAL on a file open is pretty uncommon ...
> the database data is mounted and stored to a NFS folder.
... but I've heard of it happening with unstable NFS setups.
You might check for NFS version compatibility, firewalls blocking
some of the ports NFS uses, etc.
But really my advice would be "don't access your database over NFS".
It's just not reliable enough.
regards, tom lane