One XRF complex with two CPCs and a non-XRF IMS

An XRF complex in this configuration, illustrated in the following figure, requires both active and alternate IMS systems that share databases.

This configuration, illustrated in the following figure, requires:

• Three CPCs, z/OSs, and VTAMs (only two of the CPCs, z/OSs, and VTAMs are in the XRF)
• Three IMS systems—two active and one alternate
• Databases shared by both active IMS systems and the alternate IMS
• IMS system logs for each active IMS system and one shared system log with the alternate IMS
• Remote terminals using SNA protocol and communicating with one or both of the active IMS systems
• If your XRF complex uses USERVAR, NCP running in the 37x5 Communication Controller that is attached to the CPCs

Figure 1. One XRF complex in two CPCs and a non-XRF IMS