[Hadoop Wiki] Update of "DFS" by OwenOMalley

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The following page has been changed by OwenOMalley:
http://wiki.apache.org/hadoop/DFS

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+ #redirect HDFS
- Hadoop's Distributed File System is designed to reliably store very large files across machines in
- a large cluster.  It is inspired by the [http://labs.google.com/papers/gfs.html GoogleFileSystem].
  
- ["DFS requirements"]. Summarizes the requirements Hadoop DFS should be targeted for, and outlines 
- further development steps towards achieving this requirements.
- 
- ["Hadoop Upgrade"]. Describes a step-by-step procedure for manual transition of Hadoop cluster to 
- a newer software version, and outlines enhancements intended to make the upgrade simple and safe.
- 
- Here is a brief description of the design and architecture of the [http://hadoop.apache.org/core/docs/current/hdfs_design.html Hadoop Distributed File System (HDFS)]
-