Steffen has given already all the answers,
but may be it is useful to point out:

On 7 May 2003, Steffen Neumann wrote:

> >     maximum RVM size is limited to 130M, which "is good for up to 3.3 GB".
> >     http://www.coda.cs.cmu.edu/doc/html/manual/x1199.html
> We have 20G half-filled running here.

20G data corresponds to about 1G RVM, which is near the "real" limit on
supported architectures (32-bit virtual memory addressing).

Regards,
--
Ivan