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many processes uninterruptibly sleeping



what could be the problem with a system that regularly puts quite
a number of processes into "uninterruptible sleep" (according to top)
for some minutes, and then releases them after a that (long) while?
for instance, logging in to courierpop3d through port 110 allows me to
enter user and password according to the POP3 protocol, but then
courierpop3d goes into uninterruptible sleep for several minutes
before acknowledging the successful authentication in the POP3 dialog.
even a simple /bin/ls invocation gets put into 'D' status
occassionally and will only return from that sleep after minutes of
occupying the console (not reacting to SIGINT or SIGSUSP). the logs
show nothing, and i can't access the machine physically to check if
the hardware is acting up.

i would appreciate any hints. this is a vital system and i am sweating
about it.

-- 
martin;              (greetings from the heart of the sun.)
  \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; net@madduck
 
the only real advantage to punk music is
that nobody can whistle it.

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