Dedicated, shared partitions and ICF upgrade, LP2

6947ch08.fm

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

Book 0

Book 1

2084-B16 Model 309

LP1

CP0

CP1

CP2

CP3

CP4

CP5

CP6

CP7

CP8

Spare

Logical

Res

CP0

CP1

CP2

DED

LP2

Logical

Res

CP0

CP1

CP2

CP3

CP4

CP5

SHR

LP3 (not activated)

Logical

CP0

SHR

2084-B16

Book 0

Book 1

Model 309

CP0

CP1

CP2

CP3

CP4

CP5

CP6

CP7

CP8

Spare

IFL1

IFL0

+ 2 IFLs

LP1

Logical

Res

CP0

CP1

CP2

DED

LP2

Logical

Res

CP0

CP1

CP2

CP3

CP4

CP5

SHR

LP3 (redefined with IFLs)

Logical Logical

IFL1 IFL0

DED DED

Figure 8-14 Dedicated, shared logical partitions and IFL upgrade example

This two-book server configuration has nine CPs and seven spare PUs. The concurrent hardware upgrade adds two IFL processors, using two available spare PUs on the installed books. There are two activated logical partitions, and one non-activated:

LP1 has three dedicated (DED) logical CPs and two reserved CPs defined.

LP2 has six shared (SHR) logical CPs and two reserved CPs defined.

Logical partition LP3 is defined with one shared logical CP, but is not activated.

After the upgrade, including two IFL processors, the partition LP3 is redefined to have two dedicated logical IFLs. The I/O definitions for this logical partition can be dynamically done by LP1 or LP2, if any of them has the Dynamic I/O Configuration OS support. Then partition LP3 can be activated and use the IFL processors. By using a previously defined logical partition, this upgrade is non-disruptive.

Dedicated, shared partitions and ICF upgrade

Figure 8-15 on page 215 shows a 2084-B16, software model 309 with one Internal Coupling Facility (ICF). This example is similar to the previous one, but now includes a Coupling Facility (CF) partition.

214IBM eServer zSeries 990 Technical Guide

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.

IBM 990 manual Dedicated, shared partitions and ICF upgrade, LP2

Models: 990

6947ch08.fm

LP2

Figure 8-14 Dedicated, shared logical partitions and IFL upgrade example

Dedicated, shared partitions and ICF upgrade

Figure 8-15 on page 215 shows a 2084-B16, software model 309 with one Internal Coupling Facility (ICF). This example is similar to the previous one, but now includes a Coupling Facility (CF) partition.

990 specifications