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Chapter 3 # C cascade The transfer of statistics from the Node Management Agent (NMA) on each of the peer nodes into the namespace of the master node. Cascading provides the NMA of the master node with a view of the entire cluster. CGTP (Carrier Grade Transport Protocol) A reliable transport protocol used for the transfer of IP packets over a cluster network. CGTP duplicates data packets. It transmits the duplicate data packets on both of the Ethernet networks. If one data packet is lost, the data packet sent on the second network path is able to reach the destination address. CGTP address The IP address of a CGTP interface. See also CGTP interface. CGTP interface An interface over which IP packets are transferred by using the CGTP protocol. See also CGTP and virtual physical interface. cluster A group of peer nodes that are connected by a network. To be highly available, a cluster must have the following characteristics: A master node A vice-master node Data replication between the master node and vice-master node A redundant network between all peer nodes See also peer node, master node, and vice-master node. Cluster Membership Manager See CMM. cluster network The private network over which peer nodes communicate with each other. See also external network. cluster_nodes_table A configuration file that stores the membership and configuration information for all peer nodes in a cluster. A node must have an entry in the `cluster_nodes_table` file to be part of a cluster. There is a `cluster_nodes_table` on both master-eligible nodes in the cluster. CMM (Cluster Membership Manager) A service that manages the cluster membership. The CMM performs the following tasks: Determines which nodes are members of the cluster Assigns the roles and attributes of nodes Detects the failure of nodes Notifies clients of changes to the cluster CompactPCI (Compact Peripheral Component Interconnect) CompactPSB (CompactPCI Packet Switched Backplane) custom installation Manual installation or installation using the `nhinstall` tool. See also `nhinstall`.
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