Oracle B32100-01 User Manual
Installation Order for High Availability Configurations
7-4
Oracle Application Server Installation Guide
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Increased scalability and performance
Multiple identically-configured instances provide the capability to have a
distributed workload shared among different machines and processes. New
instances can also be added as the demand of the application grows.
distributed workload shared among different machines and processes. New
instances can also be added as the demand of the application grows.
In general, the term OracleAS Clusters describes clustering at the Oracle Application
Server instance level. However, if it is necessary to call out the specific type of
instances being clustered, this document will use OracleAS Clusters (type) to
characterize the cluster solution. For example:
Server instance level. However, if it is necessary to call out the specific type of
instances being clustered, this document will use OracleAS Clusters (type) to
characterize the cluster solution. For example:
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two or more Oracle Identity Management instances are known as OracleAS
Cluster (Identity Management)
Cluster (Identity Management)
For details on OracleAS Cluster (Identity Management), see
.
7.1.3 OracleAS Disaster Recovery
OracleAS Disaster Recovery configurations have the following characteristics:
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A production site and a standby site that mirrors the production site. Typically,
these sites are located some distance from each other to guard against site failures
such as floods, fires, or earthquakes. During normal operation, the production site
handles all the requests. If the production site goes down, the standby site takes
over and handles all the requests.
these sites are located some distance from each other to guard against site failures
such as floods, fires, or earthquakes. During normal operation, the production site
handles all the requests. If the production site goes down, the standby site takes
over and handles all the requests.
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Each site has all the hardware and software to run. It contains nodes for running
OracleAS Infrastructure and the middle tiers; load balancers; and DNS servers.
OracleAS Infrastructure and the middle tiers; load balancers; and DNS servers.
OracleAS Disaster Recovery includes OracleAS Infrastructure and middle tiers. For
details, see
details, see
7.1.4 Summary of Differences
summarizes the differences among the high availability configurations.
7.2 Installation Order for High Availability Configurations
For all high availability configurations, you install the components in the following
order:
order:
Table 7–1
Differences Among the High Availability Configurations
OracleAS Cold
Failover Cluster
Failover Cluster
OracleAS Clusters
OracleAS Disaster
Recovery
Recovery
Node configuration
Active-Passive
Active-Active
Active-Passive
Hardware cluster
Yes
No
Optional (hardware cluster
required only if you
installed the OracleAS
Infrastructure in an
OracleAS Cold Failover
Cluster configuration)
required only if you
installed the OracleAS
Infrastructure in an
OracleAS Cold Failover
Cluster configuration)
Virtual hostname
Yes
No
Yes
Load balancer
No
Yes
No
1
1
Geographic load balancer may be used to perform site name switchover.
Shared storage
Yes
No
No