No Space left on Device

Hi there, I'm Jose From Canada,

I'm working with PostgreSQL 7.2 on Linux Red hat 7.3 and when I try to
create an object in the database, using PGAdmin or psql, I get this error.

create index pp_key on pp (p1) ;

Error: -2147467259 can not create object : no space left on device.

But if I check the available space on disk from linux I have a lot, more
than 4 GB and the table pp is empty.

Any clues ??? what should I check ???

Thanks in advance