Configuring high availability
Before you can configure a high-availability solution in your i5/OS environment, ensure that you have completed the appropriate planning and understand your resources and goals for high availability and disaster recovery. Use configuration scenarios for high availability and tasks associated with high availability technologies to create your own high-availability solution.
- Scenarios: Configuring high availability
Configuration scenarios provide examples of different i5/OS high availability environments and step-by-step configuration tasks to help you implement a high-availability solution based on your needs and resiliency requirements. - Setting up TCP/IP for high availability
Because cluster resource services uses only IP to communicate with other cluster nodes, which are systems or logical partitions within a high availability environment, all cluster nodes must be IP-reachable, which means that you must have IP interfaces configured to connect the nodes in your cluster. - Configuring clusters
Any i5/OS implementation of high availability requires a configured cluster to control and manage resilient resources. When used with other data resiliency technologies, such as switched disk, cross-site mirroring, or logical replication, cluster technology provides the key infrastructure that is necessary for high-availability solutions. - Specifying message queues
You can either specify a cluster message queue or a failover message queue. These message queues help you determine causes of failures in your i5/OS high availability environment. - Performing switchovers
Switchovers can be performed to test the high availability solution or to handle a planned outages for the primary node, such as a backup operation or scheduled system maintenance. - Configuring nodes
Nodes are systems or logical partitions that are participating in an i5/OS high availability solution. 
Configuring advanced node failure detection
Advanced node failure detection can be used to prevent cluster partitions when a cluster node has actually failed. A Hardware Management Console (HMC) or Virtual I/O Server (VIOS) partition can be used.- Configuring CRGs
Cluster resource groups (CRGs) manage resources within an i5/OS high availability environment. Several task enable the management of high availability resources through CRGs. - Configuring cluster administrative domains
In a high-availability environment, it is necessary that the application and operational environment remain consistent among the nodes that participate in high availability. Cluster administrative domain is the i5/OS implementation of environment resiliency and ensures that the operational environment remains the consistent across nodes.