Looking at vmstat I see the "b" colun never hits zero and it's usually between 5 and 20.

Is there a way to find out which program(s) are causing the I/O?

In some of the machines it was near trivial to find the culprit, but have a handfull of machines that I am not sure what the cause of I/O is.

The machines are mailservers so they likely will not hold any particular file open long.
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