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ePlus Data Center Architect Interview Question

I interviewed in Herndon, VA and was asked:
"(In response to stating VMware lun sizing best practice) Why would volume management of smaller luns result in lower performance than a large lun (meta)?"
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Part of a Data Center Architect Interview Review - one of 10 ePlus Interview Reviews

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Primarily due to larger amount of locking needed, but also due to immaturity of ESX volume management. Using few metas (luns) striped across a similar number of spindles, and similar port use, as the many smaller devices provides the same physical I/O performance with less overhead in ESX.
- Interview Candidate on Mar 20, 2009

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