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

 

 

6947ch09.fm

 

Table 9-2 Internal Battery Feature emergency power times

 

 

 

 

 

 

 

 

 

 

 

I/O configuration

 

 

 

 

 

 

 

 

 

Model

One I/O cage

Two I/O cages

Three I/O cages

 

 

 

 

 

 

 

 

IBM 2084 model A08

8 minutes

13 minutes

12 minutes

 

 

 

 

 

 

 

 

IBM 2084 model B16

13 minutes

8.5 minutes

10.5 minutes

 

 

 

 

 

 

 

 

IBM 2084 model C24

8.5 minutes

11 minutes

9 minutes

 

 

 

 

 

 

 

 

IBM 2084 model D32

13 minutes

8.5 minutes

7.5 minutes

 

 

 

 

 

 

 

9.1.4 Emergency power-off

On the front of frame A is an emergency power-off switch that will immediately disconnect utility and battery power from the server when activated. This causes all volatile data in the server to be lost.

In case a server is connected to a machine room emergency power-off switch, and the Internal Battery Feature is installed, the batteries will take over if the switch is engaged.

It is possible to connect the machine room emergency power-off switch to the server power-off switch. In that case, when the machine room emergency power-off switch is engaged, all power will be disconnected from the line cords and the Internal Battery Features. This causes all volatile data in the server to be lost.

9.1.5 Cooling requirements

The z990 requires chilled air from under the raised floor to fulfill the air-cooling requirements. The chilled air usually is provided through perforated floor tiles. The amount of chilled air needed in the computer room is indicated in the IMPP for a variety of underfloor temperatures.

At an underfloor temperature of 20o Celsius (68o Fahrenheit), the cooling airflow requirements with maximum populated I/O cages are listed in Table 9-3.

Table 9-3 Underfloor cooling airflow requirements (C/FM)

 

One I/O cage

Two I/O cages

Three I/O cages

 

 

 

 

IBM 2084-A08

1050

1350

1750

 

 

 

 

IBM 2084-B16

1350

1750

2200

 

 

 

 

IBM 2084-C24

1750

2200

2600

 

 

 

 

IBM 2084-D32

1750

2200

2600

 

 

 

 

9.2 Weights

Since there may be a large number of cables connected to a z990 installation, a raised floor is mandatory. In the IMPP, weight distribution and floor loading tables are published, to be used together with the maximum frame weight, frame width, and frame depth to calculate the floor loading for the z990 system.

Table 9-4 on page 232 indicates the minimum and maximum system weights for all models. The weight ranges are base on configuration models with one and three I/O cages.

Chapter 9. Environmentals 231

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IBM 990 Weights, Emergency power-off, Cooling requirements, Configuration, One I/O cage Two I/O cages Three I/O cages
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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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