1. WheelFS

2. Agenda Introduction Background Feature System Architecture Design and Details Conclusion

3. Introduction Created in the PDOS group at MIT Past Projects in PDOS: –Chord –Grid

4. Agenda Introduction Background Feature System Architecture Design and Details Conclusion

5. Background Difficulties in WAN –High latency –Low bandwidth –Failure Trade-offs MUST be made –Consistency –Availability –Performance

6. Agenda Introduction Background Feature System Architecture Design and Details Conclusion

7. Features POSIX file system API support Consistency control Replication control Swarming reads Timeout control Security // 更通俗易懂，或者一目了然

8. Agenda Introduction Background Feature System Architecture Design and Details Conclusion

9. System Architecture // 简单说几点（基本是 Basic Design ，说清 楚 ID ，文件怎么放）

10. System Architecture (Cont.) // 来张图

11. Agenda Introduction Background Feature System Architecture Design and Details Conclusion

12. Design and Details // 更细节点的东西，看着办

13. Agenda Introduction Background Feature System Architecture Design and Details Conclusion

14. // 看看有什么要说的，没有就砍掉

15. Introduction Developed by MIT CSAIL PDOS group FUSE-based DFS Appears as a tree of named directory Offers flexible wild-area storage Gives apps control via semantic cues

16. Basic Design Three basic building blocks –Storage servers –Clients –Configuration servers

17. Basic Design(Internal) Each file and dir has a unique numeric ID Each participation node also has a ID Node determine responsibility use CH

18. Consistent Hashing(like chord)

19. 谢谢