New build 2084 physical memory card distribution

6947ch02.fm

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

A book may have more memory installed than enabled. The excess amount of memory can be installed by a Licensed Internal Code code load (sometimes called “dial-a-Gig”), when required by the installation.

On initial installation, the amount of physical memory in a given model is nearest to the smallest possible size.

Memory upgrades are satisfied from already installed unused memory capacity until exhausted. When no more unused memory is available from the installed memory cards, cards have to be upgraded to a higher capacity—or the addition of a book with additional memory is necessary.

Table 2-1shows examples of memory configurations (not all possible combinations are shown). It shows that an IBM 2084 model A08 may have 16 GB of usable memory out of a minimum of 16 GB physically installed, and that an IBM 2084 model D32, though unlikely, may have 16 GB of usable memory out of a minimum of 64 GB physical memory.

Table 2-1 New build 2084 physical memory card distribution

Available	IBM 2084-A08	IBM 2084-B16	IBM 2084-C24	IBM 2084-D32
Capacity	Physical Cards	Physical Cards	Physical Cards	Physical Cards

16 Gb	2 x 8 GB	Book1: 2 x 8 GB	Book1: 2 x 8 GB	Book1: 2 x 8 GB
		Book2: 2 x 8 GB	Book2: 2 x 8 GB	Book2: 2 x 8 GB
			Book3: 2 x 8 GB	Book3: 2 x 8 GB
				Book4: 2 x 8 GB

24 GB	2 x 16 GB	Book1: 2 x 8 GB	Book1: 2 x 8 GB	Book1: 2 x 8 GB
		Book2: 2 x 8 GB	Book2: 2 x 8 GB	Book2: 2 x 8 GB
			Book3: 2 x 8 GB	Book3: 2 x 8 GB
				Book4: 2 x 8 GB

48 GB	2 x 32 GB	Book1: 2 x 16 GB	Book1: 2 x 8 GB	Book1: 2 x 8 GB
		Book2: 2 x 8 GB	Book2: 2 x 8 GB	Book2: 2 x 8 GB
			Book3: 2 x 8 GB	Book3: 2 x 8 GB
				Book4: 2 x 8 GB

64 GB	2 x 32 GB	Book1: 2 x 16 GB	Book1: 2 x 16 GB	Book1: 2 x 8 GB
		Book2: 2 x 16 GB	Book2: 2 x 8 GB	Book2: 2 x 8 GB
			Book3: 2 x 8 GB	Book3: 2 x 8 GB
				Book4: 2 x 8 GB

80 GB	n/a	Book1: 2 x 32 GB	Book1: 2 x 16 GB	Book1: 2 x 16 GB
		Book2: 2 x 8 GB	Book2: 2 x 16 GB	Book2: 2 x 16 GB
			Book3: 2 x 8 GB	Book3: 2 x 8 GB
				Book4: 2 x 8 GB

96 GB	n/a	Book1: 2 x 32 GB	Book1: 2 x 16 GB	Book1: 2 x 16 GB
		Book2: 2 x 16 GB	Book2: 2 x 16 GB	Book2: 2 x 16 GB
			Book3: 2 x 16 GB	Book3: 2 x 16 GB
				Book4: 2 x 8 GB

128 GB	n/a	Book1: 2 x 64 GB	Book1: 2 x 64 GB	Book1: 2 x 16 GB
		Book2: 2 x 64 GB	Book2: 2 x 16 GB	Book2: 2 x 16 GB
			Book3: 2 x 16 GB	Book3: 2 x 16 GB
				Book4: 2 x 16 GB

Note: The amount of memory available for use in the server is the sum of all enabled memory on all memory cards in all books.

28IBM eServer zSeries 990 Technical Guide

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.

IBM 990 manual New build 2084 physical memory card distribution

Models: 990

Table 2-1 New build 2084 physical memory card distribution

990 specifications