Oracleas Disaster Recovery; Summary Of Differences; Installation Order For High Availability Configurations - Oracle Application Server B32100-01 Installation Manual

Installation Order for High Availability Configurations

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.
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:
two or more Oracle Identity Management instances are known as OracleAS
■
Cluster (Identity Management)
For details on OracleAS Cluster (Identity Management), see
High Availability Environments: OracleAS Cluster (Identity

7.1.3 OracleAS Disaster Recovery

OracleAS Disaster Recovery configurations have the following characteristics:
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.
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 Disaster Recovery includes OracleAS Infrastructure and middle tiers. For
details, see
Disaster

7.1.4 Summary of Differences

Table 7–1
Table 7–1 Differences Among the High Availability Configurations
Node configuration
Hardware cluster
Virtual hostname
Load balancer
Shared storage
1
Geographic load balancer may be used to perform site name switchover.
7.2 Installation Order for High Availability Configurations
For all high availability configurations, you install the components in the following
order:
7-4 Oracle Application Server Installation Guide
Chapter 10, "Installing in High Availability Environments: OracleAS
Recovery".
summarizes the differences among the high availability configurations.
OracleAS Cold
Failover Cluster OracleAS Clusters
Active-Passive Active-Active
Yes No
Yes No
No Yes
Yes No
Chapter 9, "Installing in
Management)".
OracleAS Disaster
Recovery
Active-Passive
Optional (hardware cluster
required only if you
installed the OracleAS
Infrastructure in an
OracleAS Cold Failover
Cluster configuration)
Yes
1
No
No