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Cross-system Coupling Facility (XCF) Networking on z/OS |
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TCP/IP takes advantage of the communication capabilities of the XCF in a sysplex. At the heart of the sysplex is the XCF. As its name suggests, XCF handles communication between logical partitions (LPARs) or CPCs. Communication between these LPARs is effectively (from a TCP/IP perspective) instantaneous. Information such as workload, status, and data transmission occurs through the Coupling Facility. The information sharing is constant and continuous, allowing the independent z/OS images to know detailed information about the current status of all images within the sysplex. TCP/IP takes advantage of the communication capabilities of the XCF in
a sysplex in three different ways:
In order for TCP/IP to be able to utilize the services of the Coupling Facility, VTAM must be configured to support XCF connections. This is normally accomplished by starting VTAM with XCFINIT=YES specified in ATCSTRxx. As an implementation note, the Coupling Facility, if used, represents a single point of failure within a sysplex. Hence, an organization always implements a backup Coupling Facility which is ready in the event of a failure. |
Copyright IBM Corporation 1990, 2010
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