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How to check which process is using up the most disk resources in Red Hat Enterprise Linux?

Solution Verified - Updated 2014-10-31T08:44:03+00:00 -

Issue

How to check which process is using up the most disk resources in Red Hat Enterprise Linux?
Is there a utility similar to 'dtrace' from Solaris?
How can we identify application IO patterns as they are sent to disk?

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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