Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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## HADB Installation

On a single or dual CPU system, you can install both HADB and Application Server if the system has at least two Gbytes of memory. If not, install HADB on a separate system or use additional hardware. To use the `asadmin ha-configure-cluster command` , you must install both HADB and Application Server.

Each HADB node requires 512 Mbytes of memory, so a machine needs one Gbyte of memory to run two HADB nodes. If the machine has less memory, set up each node on a different machine. For example, you can install two nodes on:

- Two single-CPU systems, each with 512 Mbytes to one Gbyte of memory

- A single or dual CPU system with one Gbyte to two Gbytes of memory

  You can install HADB with either the Java Enterprise System installer or the Application Server standalone installer. In either installer, choose the option to install HADB (called High Availability Session Store in Java ES) in the Component Selection page. Complete the installation on your hosts. If you are using the Application Server standalone installer, and choose two separate machines to run HADB, you must choose an identical installation directory on both machines.

### Default Installation Directories

Throughout this manual, HADB_install_dir represents the directory in which HADB is installed. The default installation directory depends on whether you install HADB as part of the Java Enterprise System. For Java Enterprise System, the default installation directory is `/opt/SUNWhadb/4`. For the standalone Application Server installer, it is `/opt/SUNWappserver/hadb/4` .

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