Reliability consideration of a server system with replication buffering relay method for disaster recovery

Abstract

Recently, replication buffering relay method has been used in order to guarantee consistency of database content and reduce cost of replication. We consider the problem of reliability in server system using the replication buffering relay method. The server in a main site updates the storage database when a client requests the data update, and transfers the data and the address of the location updated data to a buffering relay unit. The server transmits all of the data in the buffering relay unit to a backup site after a constant number of data update. We derive the expected number of the replication and of updated data in buffering relay unit. Further, we calculate the expected cost and discuss optimal replication interval to minimize it. Finally, numerical examples are given. © 2011 Springer-Verlag.