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How can I throttle IO?

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Last Modified: 2012-05-06
Over the past year we have replaced the majority of our DAS with a SAN.  For the most part this has been very successful however I do have a couple of database applications that saturate SAN IO.  One of the applications is Microsoft SQL Server 2000 based, the other is IBM UniData based.  

I am looking for a way to throttle IO such that other applications don't suffer due to IO saturation from these databases.

I would prefer to throttle at the operating system level (Windows 2003) but will also take suggestions for throttling at the DBMS level.
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