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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Virtual Hadoop" by RobertMarshall
Date Wed, 25 Jul 2012 05:36:15 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Virtual Hadoop" page has been changed by RobertMarshall:
http://wiki.apache.org/hadoop/Virtual%20Hadoop?action=diff&rev1=7&rev2=8

  
  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 you can have other's pay for their use, but at the loss of control
of ownership of resources and/or data. Not being able to prove control of 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. 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).
  
  
  == Strengths of VM-hosted Hadoop ==

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