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

Figure 8-8 CIU upgrade selection screen

An On/Off CoD upgrade for processors cannot be applied while a previous On/Off CoD or a CBU is activated. In those cases, the requested upgrade can be retrieved, but can be applied only after the current temporary upgrade is deactivated. On/Off CoD upgrades for memory can be retrieved and applied, even while a CBU or a previous On/Off CoD activation is in place.

8.4 On/Off Capacity on Demand (On/Off CoD)

The On/Off Capacity on Demand (On/Off CoD) for z990 servers is the ability for the z990 user to temporarily turn on unowned PUs, unassigned CPs, and unassigned IFLs available within the current model, to help meet customer’s peak workload requirements. On/Off CoD uses the Customer Initiated Upgrade (CIU) process to request the upgrade via the Web, using IBM Resource Link.

On/Off CoD requires the CIU Enablement feature (FC 9898) and the On/Off CoD Enablement feature (FC 9896) installed.

Important: The On/Off CoD capability can coexist with Capacity BackUp (CBU) enablement. Both On/Off CoD and CBU LIC-CC can be installed on a z990 server, but the On/Off CoD activation and CBU activation are mutually exclusive.

The resources eligible for temporary use are CPs, ICFs, IFLs, and/or zAAPs. Temporary use of memory, and I/O ports is not supported. Spare PUs which are currently unassigned and unowned can be temporarily and concurrently activated as CPs, ICFs, IFLs, or zAAPs via LIC-CC, up to the double of the current installed capacity, and up to the limits of the physical server size. This means that an On/Off CoD upgrade cannot change the z990 server model (2084-xxx), as additional book installation is not supported. However, On/Off CoD may change the server’s software model (3xx) if additional CPs are requested.

The On/Off CoD upgrade features are:

– On/Off CoD Active CP (FC 9897)

200IBM eServer zSeries 990 Technical Guide

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IBM 990 manual On/Off Capacity on Demand On/Off CoD, CIU upgrade selection screen

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.