I have a two-node Red Hat ES 4 Cluster running with the ZCS-NETWORK-4.5.5_GA_838.RHEL4.tgz code release (June '07). This cluster is a single-node cluster (meaning one ACTIVE node with all services running on it, including LDAP and MTA,etc and one PASSIVE standby node). I am planning on going to zcs-NETWORK-5.0.2_GA_1976.RHEL4.20080130204528.tgz code release. Please, point me to all the appropriate documents needed to complete this task. Also, this will be done on the production environment, i need to be sure it goes smooth. Please, advice on all the necessary steps i have to take to ensure everything goes smoothly.