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1、uctured) (regional variant of ISO/IEC ISP 10607-3:1995) The European Standard EN ISP 10607-3:1996 has the status of a British Standard ICS 35.100.05BSEN ISP 10607-3:1997 This British Standard, having been prepared under the direction of the DISC Board, was published under the authority of the Standards Board and comes into effect on 15 March 1997 BSI 11-1998 ISBN 0 580 26518 8 National foreword This British Standard is the English language version of EN ISP 10607-3:1996. It is derived fro。

2、 rapidly developing and promoting technical and operations standards for the communications and related information technologies industry worldwide using a pragmatic, flexible and open approach. Over 1,100 participants from more than 350 communications companies are active in ATIS 22 industry committees, and its Incubator Solutions Program. www.atis.orgATIS 0401003-0003 Small Exchange Carrier Access Billing (SECAB) Guidelines Is an ATIS standard developed by the following committee(s) under t。

3、Protocol Specification Prepared by Canadian Standards Association Approved by Standards Council of Canada ISSN 031 7-5669 Published in March 1989 by Canadian Standards Association, 178 Rexdale Boulevard, Rexdale (Toronto), Ontario, Canada M9W 1R3. The Canadian Standards Association, which operates under the name CSA International (CSA), under whose auspices this National Standard has been produced, was chartered in 191 9 and accredited by the Standards Council of Canada to the National Standards。

4、genda,Introduction Aggressive replication A structural overview Replica set management Propagating updates Failure recovery System evaluation Conclusion Q&A,chen ying,3,Introduction,What is Pangaea?Pangaea is a wide-area file system that enables ad-hoc collaboration in multi-national corporations or in distributed groups of users.,chen ying,4,Introduction,Goals Speed Availability and autonomy Network economyKey technique Aggressive replication (pervasive replication) Pangaea aggressively cre。

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6、a redesign and implementation of the Sprite LFS BSD-LFS is Faster than conventional UNIX FFS (the “fast” file system of the early 80s) Not as fast as an enhanced version of FFS with read and write clustering,Historical Perspective,Early UNIX FS used small block sizes and did not try to optimize block placement The UNIX FFS Increased block sizes Added cylinder groups Incorporated rotational disk positioning to reduce delays when accessing sequential blocks,Limitations of FFS (I),Synchronous file。

7、and metadata Metadata includes modification times, permissions, etc. File systems are mounted over a particular directory,What is Userspace?,Your operating system has (at least) two modes: kernel (trusted) and user Kernelspace code has real ultimate power and can only be modified by root Base system software like filesystems are traditionally kernel modules and not changeable by normal users,FUSE,Makes it easy to write new filesystems without knowing how the kernel works without breaking unrel。

8、her has any control over the use of the information by the reader,both the author and the publisher disclaim any and all liability of any kind arising out of such use.The reader is expected to exercise sound professional judgment in using any of the informationpresented in a particular application.Additionally, neither the author nor the publisher has investigated or considered the effect ofany patents on the ability of the reader to use any of the information in a particular application.The rea。