Running the Extended Recovery Facility

The Extended Recovery Facility (XRF) is a combination of programs that includes two DB⁄DC environments to provide a high level of IMS availability to end users.

One environment is active and is called the active system. The other environment continuously tracks the processing of the first and is called the alternate system. The alternate system is ready to take over if the active system fails, or if a planned takeover is initiated (to perform maintenance, for example).