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

6947ch08.fm

CUoD provides the ability to concurrently add processors (CPs, IFLs, ICFs, and zAAPs), memory capacity, and I/O ports. The concurrent upgrade can be done by Licensed Internal Code Configuration Control (LIC-CC) only or also by installing additional book(s) and/or I/O card(s):

￿CUoD upgrades for processors are done by either:

–LIC-CC assigning and activating spare PUs up to the limit of the current installed book(s)

–Installing additional book(s) and LIC-CC assigning and activating spare PUs on installed book(s)

￿CUoD upgrades for memory are done by either:

–LIC-CC activating additional memory capacity up to the limit of the memory cards on the current installed book(s)

–Installing additional book(s) and LIC-CC activating additional memory capacity on installed book(s)

￿CUoD upgrades for I/O are done by either:

–LIC-CC activating additional ports on already installed ESCON and ISC-3 cards

–Installing additional I/O card(s) and supporting infrastructure if required on already installed I/O cage(s)

Important: If the z990 STI Rebalance feature (FC 2400) is selected at server upgrade configuration time, and effectively results in STI rebalancing, the server upgrade will be disruptive and this outage must be planned. The STI rebalancing operation may also be done independently of a model upgrade.

The z990 STI Rebalance feature may also change the Physical Channel ID (PCHID) number of ICB-4 links, requiring a corresponding update on the server’s I/O definition via HCD or HCM.

CUoD is ordered as a “normal” upgrade, also known as Miscellaneous Equipment Specification (MES).

CUoD does not require any special contract, but requires IBM service personnel for the upgrade. In most cases, a very short period of time is required for the IBM personnel to install the LIC-CC and complete the upgrade.

To better exploit the CUoD function, an initial configuration should be carefully planned to allow a concurrent upgrade up to a target configuration.

You need to consider planning, positioning, and other issues to allow a CUoD nondisruptive upgrade. By planning ahead it is possible to enable nondisruptive capacity and I/O growth for the z990 with no system power down and no associated POR or IPLs.

The Plan Ahead feature involves pre-installation of additional I/O cage(s), as it is not possible to install an I/O cage concurrently.

Note: CUoD basically provides a “physical” concurrent upgrade, resulting in more enabled

processors, memory, and/or I/O ports available to a server configuration. Thus, additional planning and tasks are required for nondisruptive “logical” upgrades; see

“Recommendations to avoid disruptive upgrades” on page 216.

Chapter 8. Capacity upgrades 189

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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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