A cluster is a loosely coupled collection of the independent
systems (nodes) that are organized into a network for sharing the
resources, and communicating with each other. If the cluster node
is not able to provide services, PowerHA® SystemMirror defines
relationships among the operating systems so that the peer cluster
nodes provide those services.
Before you start, you must complete the following prerequisites:
- • Install PowerHA SystemMirror software
on all the nodes that you want to include in the cluster.
- • Ensure that all nodes you want to include in the new cluster
meet the following requirements:
- o The same AIX® version installed
on them.
- o The same version and edition of the PowerHA SystemMirror installed
on them.
- o They must share a storage disk that you can use as the common
storage repository for the cluster.
- • Connect and configure all the IP network interfaces.
- • Discover all nodes in your subnet by using the Discovery task
in the IBM® Systems Director.
- • Request access to nodes that have a status of no access by
using the Request Access task in the IBM Systems Director.
- • Collect information to define an active communication path to
the takeover node.
The wizard automatically discovers and configures the various
communication paths between the local node and the takeover node.
If the local node and the takeover node have IP aliases associated
with them, and the aliases are reachable from the local node, the
wizard automatically configures the aliases as
PowerHA SystemMirror persistent
IP addresses.
Note: You can also supply specific values for persistent
IP addresses for the local node and the takeover node, if you prefer.
For
more information about creating clusters, see the
Create a Cluster topic in the AIX information center.