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

When the emergency is over (or the CBU test is complete), the server must be taken back to its original, permanent configuration. The CBU features can be deactivated by the customer at any time before the expiration date. Otherwise, the performance of the system will be degraded after expiration, unless CBU is deactivated.

Note: CBU for processors provides a “physical”concurrent upgrade, resulting in more

enabled processors 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.

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 CBU upgrade. See Table 6-3, “Minimum z/VM, z/VSE, VSE/ESA, TPF and Linux on zSeries Requirements” on page 148 to check software implications of CUoD, which is used by the CBU upgrade.

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

For detailed instructions refer to the zSeries Capacity Backup User’s Guide, SC28-6810, available on the IBM Resource Link.

Activation/deactivation of CBU

The activation and deactivation of the CBU function can be initiated by the customer without the need for onsite presence of IBM service personnel. The CBU function is activated and deactivated from the HMC, and in each case it is a nondisruptive task.

CBU activation

Upon request from the customer, IBM can remotely activate the emergency configuration, eliminating the time associated with waiting for an IBM service person to arrive on site to perform the activation.

A fast electronic activation is available through the Hardware Management Console (HMC) and Remote Support Facility (RSF) and could drive activation time down to minutes. The z990 server invokes the RSF to trigger an automatic verification of CBU authentication at IBM. This will initiate an automatic sending of the authentication to the customer’s server, automatic unlocking of the reserved capacity, and activation of the target configuration.

In situations where the RSF cannot be used, CBU can be activated through a password panel. In this case, a request by telephone to the IBM support center usually enables activation within few hours.

The CBU activation cannot be done when an On/Off CoD upgrade is already activated.

Image upgrades

After the CBU activation, the z990 server has more physical CPs available to the operating system image(s). The logical partition image(s) can concurrently increase the number of logical CPs by configuring reserved processors online. The operating system must have the capability to concurrently configure more processors online. If a nondisruptive CBU upgrade is needed, the same principles of nondisruptive CUoD should be applied.

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IBM 990 manual Activation/deactivation of CBU, CBU activation, Image upgrades
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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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