[Hadoop Wiki] Trivial Update of "Virtual Hadoop" by RobertMarshall

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The "Virtual Hadoop" page has been changed by RobertMarshall:
http://wiki.apache.org/hadoop/Virtual%20Hadoop?action=diff&rev1=8&rev2=9

  
  A Private Cloud is a collection of virtualized physical hardware that has added services such as catalogs of software or defined platforms that a customer can control. A private cloud differs from a public cloud in that it is generally owned and or managed by the same company or group as the customer. As an example, if I am responsible for a 100-node physical cluster, and I need to share it between Sales and Marketing that wish to perform advanced analytics with Hadoop and Engineering that wants to perform modelling of a new production plant, with each getting 50% of the capacity, I could virtualize the physical architecture and allow the pool of capacity to be shared between the competing groups, perhaps on a shared capacity or a swap-in/swap-out basis.
  
- A Public Cloud is like a Private Cloud but owned and/or managed by an outside entity, for example Amazon Elastic Web Services. Private Clouds can provide cost benefits, either because you only pay for your use, or other's pay for their use, but at the loss of control or of intermingling of data or other undesireable issues. Not being able to prove constant custody of some types of data might be a legal liability for certain types of data or industries (PCI, HIPAA).
+ A Public Cloud is like a Private Cloud but owned and/or managed by an outside entity, for example Amazon Elastic Web Services. Public Clouds can provide cost benefits, either because you only pay for your use, or other's pay for their use, but at the loss of control or of intermingling of data or other undesireable issues. Not being able to prove constant custody of some types of data might be a legal liability for certain types of data or industries (PCI, HIPAA).
  
  
  == Strengths of VM-hosted Hadoop ==