Planning resource groupsEdit online These topics describe how to plan resource groups within a PowerHA® SystemMirror® cluster. Overview for resource groupsPowerHA SystemMirror organizes resources into resource groups. Each resource group is handled as a unit that contains shared resources such as IP labels, applications, file systems, and volume groups. You define the policies for each resource group that define when and how it will be acquired or released.General rules for resources and resource groupsThere are some general rules and restrictions for resources and resource groups.Types of resource groups: Concurrent and nonconcurrentTo categorize and describe resource group behavior, you must first divide the resource groups into two types: concurrent and nonconcurrent.Resource group policies for startup, fallover, and fallbackResource group behaviors are separated into three kinds of node policies.Resource group attributesThis section provides an overview of the resource group attributes that you can use to fine-tune the startup, fallover, and fallback policies of resource groups.Moving resource groups to another nodeWhen PowerHA SystemMirror moves the resource group to another node, you have some options.Planning cluster networks and resource groupsMost nonconcurrent resource groups use service IP labels to provide access to the application to clients over the network. PowerHA SystemMirror uses IP address takeover (IPAT) via IP aliasing to keep these service addresses available in the cluster.Planning parallel or serial order for processing resource groupsBy default, PowerHA SystemMirror acquires and releases all individual resources configured in your cluster in parallel. However, you can specify a specific serial order according to which some or all of the individual resource groups are acquired or released.Planning resource groups in clusters that have sitesThe combination of intersite management policy and the node startup, fallover policies, and fallback policies that you select determines the resource group startup, fallover, and fallback behavior.Planning for replicated resourcesPowerHA SystemMirror offers integrated support for replicated resources.Planning for Workload ManagerIBM® offers AIX® Workload Manager (WLM) as a system administration resource included with the AIX® operating system.Parent topic: Planning PowerHA SystemMirror