Tech – Mainframe

Coupling Facility Control Code is an IBM licensed Internal Code that always runs under an LPAR, regardless of whether the CF is in a standalone CPC or in a general purpose CPC (where CFCC LPs are together with z/OS LPs). A standalone CPC is a CPC only allowing LPs running […]

ICFs are PUs in a CPC configured to run only CFCC code. The PUs are not shipped with a fixed function assignment, but are assigned during power-on reset (POR) or later non-disruptively by on demand offerings such as: CBU, CUoD, CIU, ON/OFF CoD.   Those offerings allow the customer to […]

A coupling facility is a special logical partition that runs the coupling facility control code (CFCC) and provides high-speed caching, list processing, and locking functions in a sysplex. HCD enables you to specify whether a logical partition can be a coupling facility, operating system, or either on certain processors. You […]

External Time Reference hardware facility (ETR) is the generic name for IBM Sysplex Timer. The ETR architecture provides the means of synchronizing TOD clocks in different CPCs with a centralized time reference, which in turn can be set accurately on the basis of UTC time standard (External Time Source). The […]

The cross-system coupling facility (XCF) component of z/OS manages communications between applications in a sysplex. XCF services allow authorized programs in a sysplex to communicate with programs on the same MVS system or other MVS systems. If a system fails, XCF services also provide the capability for batch jobs and […]