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Large Database on virtualized SQL server 2008 (vmware)

Industry experts seem to say that large databases (>500-800GB) should be placed on Raw Luns. Why? What happens if you just use a VMDK?
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So Raw Luns are not virtualized? What is their structure as opposed to a vmdk?
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Your question implied to me that clustering a sql server requires or does better with rdms (raw lun)?
Can you create a raid array with an rdms disk format?
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