6947ch07.fm

Draft Document for Review April 7, 2004 6:15 pm

For availability reasons, there should be:

￿At least two coupling links between z/OS and/or OS/390 and Coupling Facility images

￿At least two Coupling Facility images (not running on the same server)

￿At least one standalone Coupling Facility (if using system-managed CF structure duplexing or running with “Resource Sharing” only, then a standalone Coupling Facility is not mandatory)

–At least two Coupling Facility images are required for system-managed CF structure duplexing

7.2.5Coupling Facility Resource Manager (CFRM) policy considerations

Because the z990 is capable of having greater than 15 logical partitions, there is a change in the usage of the ‘PARTITION’ keyword when defining the CFRM policy via the administration utility. Support has been added to allow for two digits in the keyword ‘PARTITION(nn). The meaning of keyword also depends upon if the CF location resides on a z990 or non-z990, see Figure 7-3for more details.

If the CF LPAR id on the z990 is equal or less than x' F’, then z/OS compatibility support is not required on z/OS partitions running on non-z990 processors; see 6.2.1, “Compatibility support for z/OS” on page 134.

DATA TYPE(CFRM) REPORT(YES)

DEFINE POLICY NAME(POLICY1) REPLACE(YES)

CF NAME(FACIL01) TYPE(123456) MFG(IBM) PLANT(02) SEQUENCE(123456789012) PARTITION(01) DUMPSPACE(2000)

CF NAME(FACIL02) TYPE(123456) MFG(IBM) PLANT(02) SEQUENCE(123456789012) PARTITION(11) DUMPSPACE(2000)

CFRM Policy utility now accepts 2 digit PARTITION values

Restriction: must have compatibility or exploitation function installed on all systems in the SYSPLEX to use two digit partition values

Meaning of PARTITION

Non z990 - Partition number assigned when you defined CF partition to HCD or IOCP

z990 - LPAR identifier specified for CF partition in the LPAR image profile

Applicable to both compatibility and exploitation systems

Figure 7-3 CFRM Policy changes

7.2.6 ICF processor assignments

The advantage of using ICF Processors (PUs characterized as ICFs) instead of CPs for Coupling Facility images is that, because an ICF cannot run any z/OS or OS/390 operating systems, software licenses are not charged for those processors.

Note: There must be spare PUs to order dedicated ICFs. Refer to 2.2, “System design” on page 37’ for details.

164IBM eServer zSeries 990 Technical Guide

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IBM 990 manual ICF processor assignments, Meaning of Partition
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990 specifications

The IBM 990 series, often referred to in the context of IBM's pioneering efforts in the realm of mainframe computing, represents a unique chapter in the history of information technology. Introduced in the late 1960s, the IBM 990 series was designed as a powerful tool for enterprise-level data processing and scientific calculations, showcasing the company's commitment to advancing computing capabilities.

One of the main features of the IBM 990 was its architecture, which was built to support a wide range of applications, from business processing to complex scientific computations. The system employed a 32-bit word length, which was advanced for its time, allowing for more flexible and efficient data handling. CPUs in the IBM 990 series supported multiple instructions per cycle, which contributed significantly to the overall efficiency and processing power of the machines.

The technology behind the IBM 990 was also notable for its use of solid-state technology. This provided a shift away from vacuum tube systems that were prevalent in earlier computing systems, enhancing the reliability and longevity of the hardware. The IBM 990 series utilized core memory, which was faster and more reliable than the magnetic drum memory systems that had been standard up to that point.

Another defining characteristic of the IBM 990 was its extensibility. Organizations could configure the machine to suit their specific needs by adding memory, storage, and peripheral devices as required. This modular approach facilitated the growth of systems alongside the technological and operational demands of the business environments they served.

In terms of software, the IBM 990 series was compatible with a variety of operating systems and programming environments, including FORTRAN and COBOL, enabling users to access a broader array of applications. This versatility was a significant advantage, making the IBM 990 an appealing choice for educational institutions, research facilities, and enterprises alike.

Moreover, the IBM 990 was engineered to support multiprocessing, which allowed multiple processes to run simultaneously, further increasing its effectiveness in tackling complex computing tasks.

In summary, the IBM 990 series represents a significant advancement in computing technology during the late 20th century. With a robust architecture, versatile configuration options, and a focus on solid-state technology, the IBM 990 facilitated substantial improvements in data processing capabilities, making it a cornerstone for many businesses and academic institutions of its time. Its impact can still be seen today in the continued evolution of mainframe computing.
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