10.1.3 Planning the network configuration

When Performance Management is used on a logical host, it is necessary to configure a network so that communication is possible by using logical host names and logical IP addresses.

A logical host is a logical node that is controlled by cluster software and a unit of failover. A logical host has a logical host name and a logical IP address. Applications store data on shared disks and communicate via logical IP addresses, so that they are not dependant on physical nodes and can perform failover.

A physical host is a physical node. The host name used by a physical host (the host name displayed by the hostname command or uname -n command) is called the physical host name, and the IP address associated with the physical host name is called the physical IP address.

The following figure shows an overview of physical and logical hosts.

Figure 10‒8: Overview of physical and logical hosts

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