HACMP

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HACMP = High Availability Cluster MultiProcessing

HACMP is a software package that enables a fail-over system for Services running on AIX (clustering). The software can reassign certain IP's (called service IP's) from one node to another node. In HACMP there are 3 types of IP addresses:

  • Service IP: the IP at which the service (eg. Oracle) on a server can be reached
  • Boot IP: the address that is assigned to a ethernet adapter/system
  • Standby IP: an address that is assigned to a different card then the first 2 IP addresses

There are certain rules attached to the IP ranges. The Boot IP must be in a different range then the service IP. The Standby IP must be on a card that is not used by the boot IP or the Service IP.

The Boot IP and the Standby IP are persistant IP's, meaning they belong to the partion and not the service and cannot be moved from server to server by HACMP. This ensures that an administrator can always log on to an IP address and know he/she logs on to a certain server.

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