les_09-AS10gR3_学生手册_英文.rar.ppt

Managing and Configuring OracleAS Cluster Objectives After completing this lesson, you should be able to: Explain clustering Configure a cluster Configure application mount points Replicate configuration changes across OracleAS Cluster Configure application clustering Disable clustering What Is High Availability? Availability is defined by the percentage of time that a system or any component in that system works normally. Availability requirement is dependent on business needs. Internet applications must usually be available all the time. Redundant components may improve availability. High Availability Solution Identifying Changes in Clustering Cluster configuration information is now set in opmn.xml files in place of the ons.conf file. Distributed Configuration Management (DCM) is not included. Dynamic Discovery enables the cluster to manage itself. Identify Changes in Clustering Supported Clustering Models The following clustering models are supported: Dynamic node discovery Discovery server Connecting isolated topologies via gateways Manual node configuration Configuring Multicast Discovery with opmnassociate Executing the opmnassociate utility adds an OC4J instance to a cluster using multicast discovery. Configuring Multicast Discovery with opmnctl Executing the opmnctl command updates or deletes the multicast discovery entry within the opmn.xml file. Configuring Static Discovery Servers Configure one or more ONS nodes within the same cluster as static hubs. Configuring Cross-Topology Gateways Configure specific ONS nodes as gateways when cluster topologies are on different subnets or in different physical locations. Configuring Static Node-to-Node Communication In the static configuration model, a node list containing the host address and ONS remote listener port for each node in the cluster is supplied in the opmn.xml file. Load Balancing with Oracle HTTP Server Load balancing in Oracle Application Server 10g Release 3 (10.1.3) is dynamic. Load balancing can