6947ch08.fm

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

On/Off CoD can concurrently add processors (CPs, IFLs, ICFs, and zAAPs) up to the limit of the installed book(s) of an existing server, and is restricted to the double of the current installed capacity. On/Off CoD uses the CIU ordering process, initiated by the customer via the Web using IBM Resource Link, and makes use of CUoD techniques. On/Off CoD requires a special contract.

Unplanned upgrades

Unplanned upgrades can be done by the Capacity BackUp (CBU) for emergency or disaster/recovery situations.

CBU is a concurrent and temporary activation of Central Processors (CPs) in the face of a

loss of customer processing capacity due to an emergency in any customer’s zSeries or S/390 server or servers at any sites or locations. CBU cannot be used for peak load

management of customer workload. A CBU activation can last up to 90 days when a disaster/recovery situation occurs.

CBU features, one for each “standby” CP, are optional on z990 servers and require spare PUs on installed book(s) of the existing server. A CBU contract must be in place before the special code that enables this capability can be loaded on the customer server.

Capacity upgrade functions

Table 8-1summarizes the capacity upgrade functions available for z990 servers.

Table 8-1 Capacity upgrade functions summary

Function

Upgrades

Via

Type

Process

 

 

 

 

 

CUoD

CPs, IFLs, ICFs,

LIC

Concurrent and

Ordered as an normal

 

zAAPs

or

permanent

upgrade and activated

 

Memory

hardware installation

 

by IBM

 

I/O

 

 

 

 

 

 

 

 

CIU

CPs, IFLs, ICFs,

LIC-only

Concurrent and

Initiated via Web and

 

zAAPs

cannot add book

permanent

activated by customer

 

Memory

 

 

 

 

 

 

 

 

On/Off

CPs, IFLs, ICFs,

LIC-only

Concurrent and

Initiated via Web and

CoD

zAAPs

cannot add book

temporary

activated by customer

 

 

 

(no time limit)

 

 

 

 

 

 

CBU

CPs

LIC-only

Concurrent and

Ordered for

 

 

cannot add book

temporary

backup/recovery only

 

 

 

(up to 90 days)

and activated by

 

 

 

 

customer

 

 

 

 

 

8.2 Capacity Upgrade on Demand (CUoD)

Capacity Upgrade on Demand (CUoD) is a function available on z990 servers that enables concurrent and permanent capacity growth.

The CUoD function is based on the Configuration Reporting Architecture, which provides detailed information on system-wide changes, such as the number of configured processor units, system serial numbers, and other information.

188IBM eServer zSeries 990 Technical Guide

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IBM 990 manual Capacity Upgrade on Demand CUoD, Unplanned upgrades, Capacity upgrade functions
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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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