I/O tuning, segmentation faults and migration

Hi all, I have a little OM cluster, 6 (only 3 running now) nodes like this:

$ uname -a
Linux node4.xtal 2.4.26-om1 #5 SMP Mon Mar 20 15:06:48 CET 2006 i686
Intel(R) Xeon(TM) CPU 3.06GHz GNU/Linux

I've noticed that programs that write to stdout/stderr or a file have
some troubles when migrating, meaning that they simply crash.
If I comment out the lines involved in giving output messages I can
migrate easily.
I read that OM and high I/O software are not best friends, so I wonder
how can I solve this.
First of all, I would like to know why high I/O = crash in migrations,
secondly, which parameters should I tune to prevent migration of I/O
programs?

Thanks

d

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