Two-Host Cluster With Three Applications

On a two-host cluster with three applications, you can configure one host (phys-schost-1) as the default master of one application. You can configure the second physical host (phys-schost-2) as the default master for the remaining two applications. Assume the following example projects database file is located on every host. 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 host. 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.

• Application 1, with 5 shares, receives 50 percent of CPU.

• Application 2, with 3 shares, receives 30 percent of CPU.

• Application 3, with 2 shares, receives 20 percent of CPU.

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