Interview Question

Data Center Architect Interview Herndon, VA

(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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Interview Answer

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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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