Limitations of XRF

A takeover is not always performed when a failure occurs at an IMS installation.

For example, XRF does not address the outages caused by failures of:

• A channel or link failure that causes a break in communication between the CPC and the network communication controllers
• Failures in the telecommunication network, such as controllers, NCP, lines, and terminals
• Intersystem failures, such as those caused by JES or CTCs
• Some failures in application programs
• Loss of or damage to the IMS databases or log
• A power failure that affects both CPCs in the complex
• Some operator errors

Related reading: For information on the z/OS® Restart Manager (ARM) in an XRF complex, see z/OS planning considerations.