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

6947ch08.fm

￿The new amount of installed memory cannot cause the storage granularity or increment to change.

However, a new Reset Profile (to allow the customer to potentially select a higher storage increment to Plan Ahead for concurrent memory upgrade) will be available.

The Minimum Storage Granularity will be the required storage granularity based on what memory is currently LIC-CC installed. The Maximum Concurrent Upgrade Value will be the smaller of the amount of storage which is physically installed and the maximum storage allowed for the Minimum Storage Granularity (see 2.2.10, “LPAR storage granularity” on page 70).

CUoD for I/O

CUoD for I/O can add, concurrently, more I/O ports to a z990 server by either:

￿Enabling additional ports on the already installed I/O cards via LIC-CC.

LIC-CC-only upgrades can be done for ESCON channels and ISC-3 links, activating ports on the existing 16-port ESCON or ISC-3 daughter (ISC-D) cards.

￿Installing additional I/O cards on an already installed I/O cage’s slots.

The installed I/O cage(s) must provide the number of I/O slots required by the target configuration.

Note: I/O cages cannot be installed concurrently.

Figure 8-3 on page 193 shows an example of CUoD for I/O via LIC-CC.

I/O Cage

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Figure 8-3 CUoD for I/O LIC-CC upgrade example

Chapter 8. Capacity upgrades 193

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IBM 990 manual CUoD for I/O, + 8 Escon
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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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