ORA SPACE

In earlier post, we discussed about OracleAS Recovery Manager, a tool to perform backup and recovery operations at Oracle Application Server instances. In this post we will discuss about Loss of Host Automation (LOHA), a feature of OracleAS Recovery Manager to recover OracleAS node after operating system or hardware failure.

LOHA provides a solution for a loss of host when you want to restore the original instances to a new environment without having to reinstall the instances and preserve the application data. LOHA automates the tasks necessary for the Oracle Application Server administrator to migrate Oracle Application Server instances from one host to another. The new host can be a different host running the same operating system or the same host after system re-install.

Following are the few points to be considered while using LOHA:

• LOHA supports all middle-tier installations (Web Cache, J2EE, Portal/Wireless, Business Intelligence and Forms), and the new host’s name can be the same or different from the original host.
• For metadata repositories and Infrastructure installations, only the target host name must be the same as the original host.
• For an Oracle Identity Management installation, full automation is supported if the new hostname is the same as the original.
• LOHA does not support the Toplink standalone install type.
• Manual work is required for different host names.

LOHA can move all the Oracle Application Server instances from one host to a new host if the new host does not have any other Oracle Application Server instances already running.

Like OracleAS Recovery Manager, Loss of Host Automation (LOHA) is a functionality that must be utilized by OracleAS deployments.

How LOHA recovers the OracleAS instance to new host?

It make use of node/image backup performed at former host to build the environment at target host.

In order to implement LOHA, one can refer to standard OracleAS 10g R2 documentation.

References:

• Oracle Application Server Administrator Guide 10g Release 2 (10.1.2)
• Oracle® Application Server Administrator’s Guide 10g Release 3 (10.1.3.2.0)