Oracle B32100-01 ユーザーズマニュアル

Installing in High Availability Environments: Overview

This chapter provides an overview of the high availability configurations supported 
by Oracle Application Server. Subsequent chapters provide the details. This chapter 
also lists the common requirements.

Contents of this chapter:

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This chapter provides only a brief overview of the high availability configurations in 
Oracle Application Server. For a complete description of the configurations, see the 
Oracle Application Server High Availability Guide.

Oracle Application Server supports the following types of high availability 
configurations at installation time. Note that there are multiple variants of each type.

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For a quick summary of the high availability configurations, see 

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Oracle Application Server provides an active-passive model for its components using 
OracleAS Cold Failover Clusters. In an OracleAS Cold Failover Cluster topology, two 
or more Oracle Application Server instances are configured to serve the same 
application workload but only one instance is active at any particular time. These 
instances run on two different nodes in a hardware cluster. These two nodes also have 
access to a shared storage, on which you install the Oracle home for the Oracle 
Application Server instance.

One of the nodes in the hardware cluster is the active node. It mounts the shared 
storage and runs the Oracle Application Server instance. The other node is the passive, 
or standby, node. It runs only when the active node fails. During the failover event, the