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

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HMC

 

LAN

 

 

zSeries z990

HMC

 

G5/G6 Series

zSeries z900

Figure A-2 Multi CPC Environment

Important: Beginning with the next zSeries server, after the IBM eServer zSeries 890 and 990 all new HMCs on all currently marketed zSeries servers are intended to become closed platforms. They will only support the HMC application and not the installation of other applications such as the IBM ESCON Director and the IBM Sysplex Timer console applications.

When available, the next generation HMC is expected to communicate only with G5 Servers, and above (Multiprise 3000, G5/G6, z800, z900, z890, z990).TCP/IP is intended to be the only communications protocol supported.

z990 Hardware Management Console

A local Hardware Management Console must be connected to its Support Elements using Local Area Network (LAN) wiring. zSeries 990 provide both token ring and Ethernet options for the LAN wiring between the Hardware Management Console and the Support Elements. The necessary LAN adapters for the Support Elements and the Hardware Management Console may be specified as features on the system order.

Each Support Element has two LAN adapter options. Neither is the default; one of the following must be selected:

–Dual Ethernet SE

–Token ring/Ethernet SE

The Hardware Management Console has two LAN adapter options. Neither is the default; you must select one of the following:

–Dual Ethernet HMC

–Token ring/Ethernet HMC (traditional)

Appendix A. Hardware Management Console (HMC) 235

Page 248 Page 250
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Image 249
IBM manual Z990 Hardware Management Console, Lan
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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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