[ADMIN] PostgreSQL 9.3 ERROR

Running on Linux...has anyone else encountered this?

Receiving the following error in the pg_log file:

"could not extend the "pg_tblspc/23917/PG_9.3_201306121/16385/55041.5": wrote only 4096 of 8192 bytes at block 722183"

I was under the impression that PostgreSQL allocates 1G per tablespace file.

Thank you in advance.
Denise Ferrell