Planning the Infrastructure Implementation › Infrastructure Component Considerations › Computer Identification in Client Automation › Legacy Algorithm

Legacy Algorithm

To use the legacy algorithm for computer identification in Client Automation, you must enable the legacy algorithm.

Important! You should enable the legacy algorithm before you upgrade or start a new installation. If you change to legacy algorithm after the upgrade or installation, the legacy algorithm will generate incorrect CA-specific UUID's.

To enable legacy algorithm, use one of the following methods on Windows, Linux, or UNIX:

• To enable legacy algorithm on Windows, you must create a string value LegacyHostUUID with value “1”, under the registry key HKLM\Software\ComputerAssociates\HostUUID.
• To enable legacy algorithm on Linux or UNIX, create a file named /etc/calegacyuuid.

Note: You must enable legacy algorithm on every computer running a CA ITCM agent.

For a physical computer, the algorithm checks for the three characteristics described earlier. If at least two of these three criteria are not met, the target system is regarded as a new computer and a new CA-specific UUID is generated.

Important! UUIDs generated by earlier versions of CA Technologies’s desktop management software, such as Unicenter® Software Delivery, Unicenter® Asset Management, and Unicenter® Remote Control, may not be globally unique.