ExpressCluster X 3.1 for Linux Getting Started Guide - Nec

Chapter 2 Using ExpressClusterA failover-type cluster can be divided into the following categories depending on the clustertopologies:Uni-Directional Standby Cluster SystemIn the uni-directional standby cluster system, the active server runs applications while the otherserver, the standby server, does not. This is the simplest cluster topology and you can build ahigh-availability system without performance degradation after failing over.ApplicationApplicationFailoverFigure 2-5 Uni-directional standby cluster systemSame Application Multi Directional Standby Cluster SystemIn the same application multi-directional standby cluster system, the same applications areactivated on multiple servers. These servers also operate as standby servers. The applications mustsupport multi-directional standby operation. When the application data can be split into multipledata, depending on the data to be accessed, you can build a load distribution system per datapartitioning basis by changing the client’s connecting server.ApplicationApplicationFailoverApplicationApplication- The applications in the diagram are the same application.- Multiple application instances are run on a single server after failover.Figure 2-6 Same application multi directional standby cluster system38ExpressCluster X 3.1 for Linux Getting Started Guide