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

￿24 processors (sum of CPs and zAAPs) within a single logical partition.

￿zSeries Application Assist Processors (zAAPs).

Dynamic addition and deletion of a logical partition name

z/OS V1.6 supports dynamic naming of a reserved logical partition. Reserved logical partitions are defined with a name placeholder ‘ * ’ and can be dynamically named or removed from the list of named logical partitions.

A dynamic partition must be reserved in the IOCDS and will be established when a Power-On Reset with this IOCDS is executed. A reserved partition has a MIF ID and usage type assigned.

24 processors within a single logical partition

z/OS V1.6 supports up to 24 processors (the sum of CPs and zAAPs). Note that the sum of initial and reserved processors, including CPs and zAAPs, for an ESA/390 mode logical partition can go up to 32 processors.

zSeries Application Assist Processor (zAAP)

Support for the zSeries Application Assist Processor is introduced in z/OS V1.6. This z/OS release is planned to be available in September 2004.

Note: zAAPs are not supported for a z/OS guest under z/VM.

A zAAP reduces the standard processor (CP) capacity requirements for Java applications freeing up capacity for other workload requirements. zAAPs do not increase the MSU value of the processor and therefore do not affect the software license fee.

zAAPs only run Java code. The IBM SDK for z/OS, Java 2 Technology Edition (the Java Virtual Machine) in cooperation with z/OS, and PR/SM directs JVM processing from CPs to zAAPs. Apart from the cost savings this may realize, the integration of Java based applications with their associated data base systems such as DB2, IMS, or CICS may simplify the infrastructure, e.g. reducing the number of TCP/IP programming stacks, and server interconnect links. Furthermore, processing latencies, that would occur if Java application servers and their data base servers were deployed on separate server platforms, are prevented.

138IBM eServer zSeries 990 Technical Guide

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IBM 990 manual Dynamic addition and deletion of a logical partition name, Processors within a single logical 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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