Each of the eight processor unit or PU chips is characterized by IBM during installation or by customers at a later time. The most common characterizations are:
•Central processor, which is abbreviated CP. This type is for use with an operating system and user applications. Mainframe operating systems are sophisticated products with substantially different characteristics and purposes. One mainframe can run more than one operating system at the same. The z9 EC supports these operatingsystems:
z/OS®
z/VM®
z/VSE™
Linux®for zSeries®
z/TPF
•System Assistance Processor, which is abbreviated SAP. Every mainframe has at least one SAP; larger systems may have several. The SAP shandle input/output subsystem operations; for example, SAPsmanage multiple paths to control units and perform error recovery for temporary errors.
•Integrated Facility for Linux, or IFL. This type helps reduce software costs on the mainframe. It supports new Linux workloads and open standards onthe System z platform.
•System z9 Application Assist Processor, or zAAP. This type also helps reduce software costs on the mainframe. It supports the same Java™code that can be run on a standard central processor.
•System z9 Integrated Information Processor, or zIIP. This type handles some database-related workloads. The zIIPreinforces the mainframe’s role as the data hub of the enterprise by helping to make direct access to DB2 more cost effective and reducing the need for multiple copies of the data.
•Integrated Coupling Facility, or ICF. This processor type allows a group of mainframes to share data. A coupling facility is, in effect, a large memory scratch pad used by multiple systems to coordinate work.
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