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= Concept of Distributed =
 * DFS Classification (M, Satyanarayanan from the perspective of FS design & computing model can be classified into 4 levels)
  * Single user single process, example:IBM PC-DOS & Apale Macintosh
  * Single user multi-processes, example:OS/2 
  * Multi-users share data, example:Unix is the archetype of a timesharing FS
  * Multi-user physically dispersed in a network of autonomous computers share in the use of a common FS, example:Distributed FS
   

= Reference =
 * [attachment:Satya_Survey.pdf M. Satyanarayanan, “A survey of distributed File System,” Department of computer Science carnegie mellon university, 1989]
 * [attachment:分散式文件系統.pdf 黃華、楊德志、張建剛，分散式文件系統，「中國科學院計算技術研究所工程中心」]