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

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Concurrent upgrades are not supported with CPs defined as additional SAPs.

If reserved processors are defined to a logical partition, then z/OS, OS/390, and z/VM operating system images can dynamically configure more processors online, allowing nondisruptive processor upgrades. The Coupling Facility Control Code (CFCC) can also configure more processors online to Coupling Facility logical partitions using the CFCC image operations panel.

Memory

Memory can be concurrently added to a z990 server up to the physical installed memory limit. Additional book(s) can also be installed concurrently, allowing further memory upgrades by LIC-CC enabling memory capacity on the new book(s).

Using the previously defined reserved memory, z/OS and OS/390 operating system images can dynamically configure more memory online, allowing nondisruptive memory upgrades.

I/O

I/O cards can be added concurrently to a z990 server if all the required infrastructure (I/O slots and STIs) is present on the configuration. The Plan Ahead process can assure that an initial configuration will have all the infrastructure required for the target configuration.

Also I/O ports can be concurrently added by LIC-CC, enabling available ports on ESCON and ISC-3 daughter cards.

Dynamic I/O configurations are supported by some operating systems (z/OS, OS/390, and z/VM), allowing nondisruptive I/O upgrades. However, it is not possible to have dynamic I/O reconfigurations on an standalone Coupling Facility server because there is no operating system with this capability running on this server. Dynamic I/O configurations require additional space in the HSA for expansion.

PCI Cryptographic coprocessors

PCI cryptographic (PCIXCC and PCICA) cards can be added concurrently to a z990 server if all the required infrastructure, I/O slots and STIs, is present on the configuration. The Plan Ahead process can assure that an initial configuration will have all the infrastructure required by the target configuration.

In order to make the addition of PCIXCC and/or PCICA cards nondisruptive, logical partitions must be predefined with the appropriate PCI cryptographic processor number selected in its candidate list, on the partition image profile. To maximize concurrent upgrade possibilities in this area, it is recommended that all logical partitions define all possible PCI cryptographic coprocessors as candidates for the logical partition. This is possible even if there are no PCI cryptographic coprocessors currently installed on the machine.

8.6.1 Upgrade scenarios

The following scenarios are examples of nondisruptive upgrades, showing the hardware (z990 server) upgrades and the image (logical partitions) upgrades. Only the images previously configured with Reserved Processors and/or Reserved Memory can be nondisruptively upgraded. Spare PUs are used for hardware upgrades and “spare logical processors” (Reserved Processors) are used for image upgrades.

Tip: Configure as many as possible reserved CPs, IFLs, ICFs, zAAPs and memory to a logical partition to allow concurrent image upgrades.

Chapter 8. Capacity upgrades 209

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IBM 990 manual Upgrade scenarios, Memory, PCI Cryptographic coprocessors
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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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