Replica administration without data loss in a store and forward

Details Replica administration without data loss in a store and forward Replica administration without data loss in a store and forward

1996-07-12

1998-07-28

Lall, Parshotam S.

Data processing: database and file management or data structures

Database design

Data structure types

39520046, 39520047, 39520048, 39520049, 39520066, 39520067, 39518204, 39518205, 707201, 707202, 707203, 364285, 3642854, G06F 1516, H04L 1200

Patent

active

057872473

ABSTRACT:
A system and method for replica administration without data loss is disclosed. In a replication environment where data is replicated around a network and where any system can make changes to the data, data loss may occur if one copy of the data is deleted before changes made to that copy are replicated to other systems in the network. The present invention describes a robust administration environment which prevents inadvertent data loss by verifying that changes made to a local copy of the data reside on at least one other system in the network. The system and method of the present invention also provide a mechanism to allow an administrator to bypass such safeguards in appropriate circumstances in order to handle special cases such as total removal of the data from the network. The replica administration environment is implemented by defining various states that represent the level of participation in the replication of the data. For example, an active state can indicate full participation while a deleted state can indicate no participation. In addition to an active state and a deleted state, one or more intermediate states may be defined. The checks and safeguards can be performed in these intermediate states. In appropriate circumstances, an administrator may force the transition from certain of the intermediate states to either the active state in order to return a system to full participation or to the deleted state in order to bypass the safeguards of the present invention.

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Yavin, d. "Replication's Fast Track," BYTE, Aug. 1995, pp. 88a-88d, 90.

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