NL's running at 200 iops can be possible but only if they are processing 100% sequential iops. (e.g. AO or a rebuild/sparing of a failed drive). Please have a look at the servicetimes during this load. if below 20msec i wouldn't worry to much, but if they are more like e.g. 50msec, than it is clear they are heavily overloaded.
are you using AO?
_________________ The goal is to achieve the best results by following the clients wishes. If they want to have a house build upside down standing on its chimney, it's up to you to figure out how do it, while still making it usable.
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