Synchronizing Cluster Configuration Settings

During synchronization, Application Center replicates controller and cluster configuration settings to all of the cluster members.

NOTE

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During synchronization, a member that is in offline state (for load balancing) is still synchronized to the controller unless you explicitly disable synchronization on that member.

Even if synchronization is disabled on a member, there are certain settings that are still copied from the controller to each member on an ongoing basis. This is done to ensure that every member has up-to-date information about the cluster infrastructure and topology. Some examples of this configuration information are: IP address binding, network adapter information, and server computer names.

See also: Appendix G, "Managing IISIP Bindings."

Replicating Network Settings

The controller replicates several network settings across the cluster, including the following:

• The load-balanced IP address on the front-end network adapter in a multi-adapter configuration
• IP subnet
• Default gateway and gateway cost metric
• DNS server search order
• DNS domain
• Primary and Secondary WINS server
• WINS node type

Replicating NLB Settings

In a cluster that has NLB enabled, the controller replicates the following information:

• The cluster name.
• The cluster IP address.
• The message exchange period (in milliseconds) between cluster nodes.
• The number of messages that can be missed from a node before initiating convergence.
• The User Datagram Protocol (UDP) that should be used to receive remote control commands.
• A switch that specifies whether or not remote control and enumeration are enabled for the controller.
• The start and end port numbers for disabled port rules.
• The start port number, end port number, protocol, and affinity for load-balanced port rules.