6947ch03.fm

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

 

 

2084-D32 CEC Cage

 

 

 

Book 3

Book 0

Book 1

Book 2

MBAMBAMBA MBAMBAMBA MBAMBAMBA MBAMBAMBA

0

1

2

0

1

2

0

1

2

0

1

2

STIs

 

 

 

 

 

 

 

 

 

 

 

STI Links

 

 

 

 

 

 

 

 

 

 

I/O Cards

 

 

 

 

 

 

 

 

 

 

 

I/O Cage 1

 

 

 

 

 

 

 

I/O Cage 2

I/O Domains

 

 

 

 

 

 

 

 

 

 

 

Figure 3-6 Upgrade example with the STI Rebalance feature (FC 2400)

Now you can see that the required number of STI links is spread across all books MBAs, including the two newly installed books 2 and 3, and redistributed across the existing I/O cages. The result is a balanced STI system, as if a new build 2084-D32 server was initially configured.

On the other hand, an upgrade including the STI Rebalance feature (FC 2400) is disruptive, as STI cables must be reconnected to other STI locations, affecting the corresponding I/O domains. After the Power-on Reset, SAPs are assigned to channel cards using the new STI links configuration.

Important: If the z990 STI Rebalance feature (FC 2400) is selected at server upgrade configuration time, and effectively results in STI rebalancing, the server upgrade will be disruptive.

The z990 STI Rebalance feature may also change the Physical Channel ID (PCHID) number of ICB-4 links (see “Physical Channel IDs (PCHIDs)” on page 86), requiring a corresponding update on the server’s I/O definition via HCD/HCM.

Adding a book via MES will result in STI plugging that is different from new build STI plugging with the same number of books. FC 2400 can be ordered to replug the STIs as new builds. The concurrent addition of a single book is supported, but be aware that regardless of how the customer planned the previous configuration, the CHPID Mapping Tool (CMT) can be used to evaluate the effects of FC2400 on the current configuration.

￿If you take the current IOCP statements and the current CFReport (provided by the IBM Account Representative) and input these via the availability option in the CMT, it will be

82IBM eServer zSeries 990 Technical Guide

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IBM 990 manual Cage, Upgrade example with the STI Rebalance feature FC
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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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