Steven Hirsch <snhirsch@gmail.com> writes:
> I notice that PostgreSQL (both 9.5.4 and 9.6) create a 'data2' directory
> as a peer to the 'data' directory I specified at database initialization.
> What is this directory for and what parameter determines its location?
Postgres itself certainly does no such thing. Maybe it's being done in
some wrapper script you're using?
regards, tom lane