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

6947ch08.fm

Then the 2084-B16, software model 309, is concurrently upgraded to a software model 310 (10 CPs) with two IFLs by assigning and activating three more spare PUs (one as CP and two as IFLs).

Additional logical processors can be concurrently configured online to logical partitions by the operating system when reserved processors are previously defined, resulting in image upgrades. The operating system must have the capability to concurrently configure more processors online.

Attention: Up to 32 logical processors, including reserved processors, can be defined to a logical partition. z/OS 1.6 is planned to support up to 24 processors, as a combination of CPs and zAAPs. z/VM 5.1 is planned to support up to 24 processors, which can be either all CPs or all IFLs.

Software charges based on the total capacity of the server on which the software is installed would be adjusted to the maximum capacity after the CUoD upgrade. Refer to Table 6-3, “Minimum z/VM, z/VSE, VSE/ESA, TPF and Linuxon zSeries Requirements” on page 148 to check software implications for CUoD.

Software products using Workload License Charge (WLC) may not be affected by the server upgrade, as their charges are based on partition utilization and not based on the server total capacity. Refer to 6.8, “Workload License Charges” on page 150, for more information about WLC.

CUoD for memory

CUoD for memory can add, concurrently, more memory to a z990 server by enabling, via LIC-CC, additional capacity up to the limit of the current installed memory cards, and/or by installing concurrently additional book(s) and LIC-CC enabling memory capacity on the new book(s).

The memory card sizes on the z990 are 8, 16, or 32 GB, and each book has two memory cards with the same physical storage capacity.

Note: Upgrades requiring memory card changes on any installed book are disruptive.

Table 2-1 on page 28 lists the range of system memory associated with a given memory card size and the number of memory cards for each server model. Figure 8-2 shows an example of CUoD for memory of a 2084-A08 server with 24 GB of available memory.

Chapter 8. Capacity upgrades 191

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IBM 990 manual CUoD for memory
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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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