HA Cluster Software - Roles

• Allow us to configure services, and spread that configuration info on several cluster nodes.
• Make it easy to launch those services on any of the cluster nodes.
• Make it easy to move a running service from one node to another (e.g. to allow upgrading the operating system or service software on the first node).
• Monitor the availability of the service
• Automatically switch a failed service to a different node.
  
  Note: the switch should be as transparent to users as possible. This requires some support from the client and server software.

Originally written by guy keren