Oracle B32100-01 - Manual (Page 123)

Requirements for High Availability Configurations
Installing in High Availability Environments: Overview 7-5
1. OracleAS Metadata Repository
2. Oracle Identity Management components
If you are distributing the Oracle Identity Management components, you install
them in the following order:
a. Oracle Internet Directory and Oracle Directory Integration Platform
b. OracleAS Single Sign-On and Oracle Delegated Administration Services
3. Middle tiers
Note that you can install middle tiers before the other components and reassociate
them with the high availability configuration following installation of the other
components.
7.3 Requirements for High Availability Configurations
This section describes the requirements common to all high availability configurations.
In addition to these common requirements, each configuration has its own specific
requirements. See the individual chapters for details.
The common requirements are:
■
Section 7.3.1, "Check Minimum Number of Nodes"
■
Section 7.3.2, "Check That Groups Are Defined Identically on All Nodes"
■
Section 7.3.3, "Check the Properties of the oracle User"
■
Section 7.3.4, "Check for Previous Oracle Installations on All Nodes"
7.3.1 Check Minimum Number of Nodes
You need at least two nodes in a high availability configuration. If a node fails for any
reason, the second node takes over.
7.3.2 Check That Groups Are Defined Identically on All Nodes
Check that the /etc/group file on all nodes in the cluster contains the operating
system groups that you plan to use. You should have one group for the oraInventory
directory, and one or two groups for database administration. The group names and
the group IDs must be the same for all nodes.
See Section 2.6, "Operating System Groups" for details.
7.3.3 Check the Properties of the oracle User
Check that the oracle operating system user, which you log in as to install Oracle
Application Server, has the following properties:
■
Belongs to the oinstall group and to the osdba group. The oinstall group is
for the oraInventory directory, and the osdba group is a database administration
group. See
Section 2.6, "Operating System Groups" for details.
Note: You still need to meet the requirements listed in Chapter 2,
"Requirements" , plus requirements specific to the high availability
configuration that you plan to use.