Patent
1996-05-28
1998-04-14
Kulik, Paul V.
39518218, G06F 1730
Patent
active
057404321
ABSTRACT:
In a client/server computing system, a method and apparatus for efficiently storing entries in a log file during disconnected client operations. An encoder utilizes a log file and a write file table for logging the write operations performed by the client during disconnected operations. The logging method employed by the encoding module logs in the log file only writes associated for different files. The encoding module tracks the status of the entries in the log file with a write file table containing the most recent sequence number associated with a file entry of the log file. Upon reconnection of the client to the server, a decoding module replays the events in the correct chronological order by transferring the file data modified during the period of disconnection in the order dictated by the write file table. A deferred write list is accessed by the decoding module for temporary storage any write operations whose replay should be delayed to preserve the relative order of events.
REFERENCES:
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M. Satyanarayanan et al., "On the Vbiquity of Logging in Distributed File Systems", Workstation Operating Systems, 1992, pp. 122-125.
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Knearl Homer L.
Kubida William J.
Kulik Paul V.
Sun Microsystems Inc.
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