pg_dump and pg_dumpall is hanging

Hi,

    I am using 8.1.0 for my production.   The pg_dumpall was working fine on
all these days.  Suddenly from yesterday, the pg_dumpall command fails.
Fails means, it hangs (no dump) is taking place.

    What may be the problem?

Regards
skarthi

_________________________________________________________________
Mortgage rates as low as 4.625% - Refinance $150,000 loan for $579 a month.
Intro*Terms

https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h27f6&disc=y&vers=743&s=4056&p=5117