IBM AIX HACMP SG24-5131-00, Hardware User Manual

Page: 46 / 240

28
IBM Certification Study Guide AIX HACMP
withdraw the 7135 RAIDiant Systems from marketing because it is equally
possible to configure RAID on the SSA Subsystems.
2.4 Resource Planning
HACMP provides a highly available environment by identifying a set of
cluster-wide resources essential to uninterrupted processing, and then
defining relationships among nodes that ensure these resources are
available to client processes.
When a cluster node fails or detaches from the cluster for a scheduled
outage, the Cluster Manager redistributes its resources among any number of
the surviving nodes.
HACMP considers the following as resource types:
• Volume Groups
• Disks
• File Systems
• File Systems to be NFS mounted
• File Systems to be NFS exported
• Service IP addresses
• Applications
The following paragraphs will tell you what to consider when configuring
resources to accomplish the following:
• IP Address Takeover
• Shared LVM Components
• NFS Exports
and the options you have when combining these resources to a resource
group.
2.4.1 Resource Group Options
Each resource in a cluster is defined as part of a resource group. This allows
you to combine related resources that need to be together to provide a
particular service. A resource group also includes the list of nodes that can
acquire those resources and serve them to clients.
A resource group is defined as one of three types: