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108 IBM Certification Study Guide AIX HACMP
4.3 Defining Resources
The HACMP for AIX software provides a highly available environment by
identifying a set of cluster-wide resources essential to uninterrupted
processing, and then by defining relationships among nodes that ensure
these resources are available to client processes. Resources include the
following hardware and software:
• Disks
• Volume groups
• File systems
• Network addresses
• Application servers
In the HACMP for AIX software, you define each resource as part of a
resource group. This allows you to combine related resources into a single
logical entity for easier configuration and management. You then configure
each resource group to have a particular kind of relationship with a set of
nodes. Depending on this relationship, resources can be defined as one of
three types: cascading, concurrent access, or rotating. See 2.4.1, “Resource
Group Options” on page 28 for details.
After configuring the cluster topology, you must configure resources and set
up the cluster node. This involves:
• Configuring resource groups and node relationships to behave as desired
• Adding individual resources to each resource group
• Setting up run-time parameters for each node
• Synchronizing cluster nodes
4.3.1 Configuring Resource Groups
Resource Groups are initialized by telling the HACMP ODM their names, the
participating nodes, and their relationship. The order in which the
participating nodes are defined is taken as the priority of the resource chain,
that is, priority is decreasing from left to right.
The relationship can be one of Cascading, Rotating or Concurrent. See 2.4.1,
“Resource Group Options” on page 28 for details.