PRIMECLUSTER Installation and Administration Guide 4.1 (for Linux) |
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Part 2 Installation | > Chapter 6 Building Cluster Applications | > 6.7 Setting Up Cluster Applications |
Set up exclusive relationships for the cluster applications to prevent cluster applications with exclusive relationships from operating simultaneously. An exclusive relationship can be set up only between standby cluster applications. If failover occurs, determine the cluster applications that should continue operating by using the job priority of the cluster applications between which an exclusive relationship is set.
Exclusive control is established between cluster applications within a single group.
The operation of cluster applications, between which an exclusive relationship is set up, during failover can be explained in the following two cases:
The example below explains the exclusive relationship between cluster applications within a single group. Even when there are multiple groups, the operation within a single group is the same.
Cluster applications with the highest job priority take the top priority for startup on the nodes on which the cluster applications with high job priority are running or on the nodes to which the cluster applications with high job priority are failed over. Therefore, cluster applications with low priorities under a startup will be forcibly exited.
The states indicated in the following figure are as follows:
If failover occurs in a cluster application with a high job priority, the cluster application with the high job priority will always be in the operating state.
Failover occurs for a cluster application with a low job priority only when there is no cluster application with a high job priority included on the node to which the cluster application with a low job priority is to be failed over.
The operation of the cluster applications that are already running will be continued. On the node on which cluster applications are already running, cluster applications that subsequently start up will be stopped.
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