IP address takeover

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IP address takeover (IPAT) is a networking capability that allows a node to acquire the network address of a node that has abandoned the cluster.

IP address takeover is necessary in a PowerHA® SystemMirror® cluster when a service being provided to clients is bound to a specific IP address, that is, when a service IP label through which services are provided to the clients is included as a resource in a cluster resource group. If, instead of performing an IPAT, a surviving node simply did a disk and application takeover, clients would not be able to continue using the application at the specified server IP address. PowerHA SystemMirror uses IPAT via Aliases.

The following figures illustrate IP address takeover.

Configuration before IP Address Takeover via IP aliases — Figure 1. Configuration before IP address takeover via IP aliases

Configuration after IP Address Takeover via IP aliases — Figure 2. Configuration after IP address takeover via IP aliases