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Highly available process support systems: implementing backup mechanisms

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2 Author(s)
Hagen, C. ; Credit Suisse, Zurich, Switzerland ; Alonso, G.

Availability in process support systems (PSS) can be achieved by using standby mechanisms that allow a backup server to take over in case a primary server fails. These mechanisms, resembling the process pair approach used in operating systems, require the primary to send information about state changes to the backup on a regular basis. In PSS where all relevant state information is stored in a database, there are two principal strategies for synchronizing a primary-backup pair. One is to use the replication mechanisms provided by the DBMS. Another is to implement a message mechanism to exchange state information between servers above the database level. For both approaches, several variants exist that allow to trade run-time performance for failover time. This paper discusses the possible strategies and evaluates their performance based on an implementation within the OPERA process support kernel

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Reliable Distributed Systems, 1999. Proceedings of the 18th IEEE Symposium on

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