A fast disaster recovery mechanism for volume replication systems
HPCC'07 Proceedings of the Third international conference on High Performance Computing and Communications
Dynamic Synchronous/Asynchronous Replication
ACM Transactions on Storage (TOS)
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Asynchronous replication protocol is playing an increasingly important role in the design of a remote disaster-tolerance system. A resilient windowconsistent asynchronous replication protocol (RWAR) is presented in this paper. RWAR increases the synchronous feature of asynchronous replication protocol by setting replication space-windows. This can achieve widow-consistency and decrease the risk of the inconsistency between the primary and backup systems. Simultaneously, RWAR dynamically adjusts the size of every space-window by setting checkpoints behind space-windows and calculating the system bandwidth-utility. This can strengthen the resiliency and flexibility of every space-window and ensure the replication performance of the primary system. It's proved with experiments that RWAR affords trade-off between data consistency and replication performance. It is helpful to construct a practical replication-based disaster-tolerance system.