Sun Cluster 3.1 Concepts Guide

Two-Node Cluster With Three Applications

On a two-node cluster with three applications, you can configure one physical host (phys-schost-1) as the default master of one application and the second physical host (phys-schost-2) as the default master for the remaining two applications. Assume the following example projects database file on every node. The projects database file does not change when a failover or switchover occurs.

Prj_1:103:project for App-1:root::project.cpu-shares=(privileged,5,none)
Prj_2:104:project for App_2:root::project.cpu-shares=(privileged,3,none) 
Prj_3:105:project for App_3:root::project.cpu-shares=(privileged,2,none)  

When the cluster is running normally, Application 1 is allocated 5 shares on its default master, phys-schost-1. This number is equivalent to 100 percent of CPU time because it is the only application that demands CPU time on that node. Applications 2 and 3 are allocated 3 and 2 shares, respectively, on their default master, phys-schost-2. Application 2 would receive 60 percent of CPU time and Application 3 would receive 40 percent of CPU time during normal operation.

If a failover or switchover occurs and Application 1 is switched over to phys-schost-2, the shares for all three applications remain the same. However, the percentages of CPU resources are reallocated according to the projects database file.

The following diagram illustrates the normal operations and failover operations of this configuration.

Illustration: The preceding context describes the graphic.