Method of replicate file updating by monitoring file accesses an

Details Method of replicate file updating by monitoring file accesses an Method of replicate file updating by monitoring file accesses an

1993-03-10

1995-09-19

Black, Thomas G.

Boots, shoes, and leggings

3649621, 3649665, 364DIG2, G06F 1730, G06F 1300

Patent

active

054524482

ABSTRACT:
A read/write replica of a file in a file server is updated through a communication line by a client. At the same time, a replica server detects the update data by using a virtual communication line between the client and a read-only replica of the file. The update data are used for refreshing the read-only replica. The refreshing process makes it unnecessary to send the update data from the file server to the replica server. Also, communication is made between the file server and the replica server to confirm validity of the update information taken in by the replica server to maintain equality of the files of the file server and the replica server. This can efficiently refresh the read-only replica of the replica server in a distributed data processing system without re-sending the update data.

REFERENCES:
patent: 4558413 (1985-12-01), Schmidt et al.
patent: 4771375 (1988-09-01), Beglzn et al.
patent: 5018060 (1991-05-01), Gelb et al.
patent: 5089958 (1992-02-01), Horton et al.
patent: 5138710 (1992-08-01), Kruesi et al.
patent: 5267867 (1994-04-01), Kenley et al.

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