I would have responded to this thread earlier but I was out late last
week. We had tons of problems with our ldm server running Linux last
fall which sounds very similar to the behavior you are describing. I
had migrated our LDM from Freebsd to Linux (Slackware, not that it makes
much difference) and had huge problems with I/O waits bogging the entire
system down. ...
What version of the kernel were you running? For example
$ uname -r
Versions of the 2.6 kernel earlier than 2.6.10 (I think) appear to have
a very bad I/O performance bug.
I built every release from 2.6.7 though 2.6.9. I though I had tried a
release candidate 2.6.10 but it's not in my notes so I'm not sure of the
details. I had given up a significant amount of time trying to get it
to work and had to draw the line somewhere so I migrated back to Freebsd
at the end of November. I may revisit Linux on our ldm next time we
have a hardware upgrade, it just wasn't up to the task at the time.
Meteorology Dept. Systems Administrator
Lyndon State College