In Conclusion

To make a resource highly available, you need to eliminate single points of failure and understand how to properly administer a highly available server pair. To administer a highly available server pair, you need to know how to failover a resource from the primary server to the backup server manually so that you can do maintenance tasks on the primary server without affecting the resource's availability. Once you know how to failover a resource manually, you can place it under Heartbeat's control by creating the proper entry or entries in the haresources file to automate the failover process.