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

6947ch07.fm

updated CFCC code to a CF logical partition, simply deactivate and activated the partition. When the CF comes up, it displays its version on the OPRMSG panel for that partition.

￿Continue to run other LPARs on the z990 where a ‘disruptive’ CFCC patch is applied without being impacted by the application of the patch.

CFCC levels supported on a z990

CFLEVEL

Minimum software levelsa

CFLEVEL 12

￿ z/OS 1.4 and above is required to fully exploit

￿ 64-bit support, removal of the 2 GB line

the functions.

 

￿ System Managed CF Structure Duplexing

￿ z/OS 1.2 and above with APAR OW41617 is

minimum for System Managed CF Structure

￿ Support for Message Time Ordering

Duplexing.

 

 

￿ All supported levels of z/OSb and OS/390

 

2.10 with PTFs can be used with CFLEVEL

 

12, but may not take advantage of the

 

enhancements.

 

 

CFLEVEL 13

￿ All supported levels of z/OSc and OS/390

￿ CFCC enhanced patch apply

2.10 with PTFs can be used with CFLEVEL

13, but may not take advantage of the

￿ CFCC performance improvements

enhancements.

benefitting castout processing against large

 

DB2 group buffer pool structures

 

 

 

a. Always consult the latest PSP bucket for 2084DEVICE and the appropriate subset for the lat- est maintenance information.

b. z/OS1.1 is not supported on the z990 c. z/OS1.1 is not supported on the z99

Note: When migrating to a new CFCC level, lock, list, and cache structure sizes will typically increase to support new functions.

This adjustment can have an impact when the system allocates structures or copies structures from one Coupling Facility to another at different CFCC levels.

The Coupling Facility structure sizer tool can size structures for you and takes into account the amount of space needed for the current CFCC levels.

The CFSIZER tool can be found at:

http://www.ibm.com/servers/eserver/zseries/cfsizer

CFLEVEL 13 has improvements that benefit some software environments in a Parallel Sysplex. Especially DB2 data sharing may expect a performance improvement for castout processing against large DB2 group buffer pool structures.

For additional details on CF code levels see the following link:

http://www.ibm.com/servers/eserver/zseries/pso/cftable

For additional details regarding CF configurations, see the paper Coupling Facility

Configuration Options, GF22-5042, available from the Parallel Sysplex Web site:

http://www.ibm.com/servers/eserver/zseries/pso/

Chapter 7. Sysplex functions 161

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IBM 990 manual Cflevel, Minimum software levels a
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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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