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

6947ch07.fm

Sysplex cluster must be configured with redundant hardware (for example, a Coupling Facility and a Sysplex Timer in each site), and the cross-site connections must be redundant.

Site 1

 

 

Network

 

Site 2

 

 

 

 

zSeries

 

 

High Performance

 

zSeries

 

 

Routing

 

11 12

1

11 12

1

10

 

2

10

 

2

9

 

3

9

 

3

8

 

4

8

 

4

7

6

5

7

6

5

CF01

40km max

CF02

 

with DWDM

 

SW

 

SW

 

 

 

Remote copy

 

(PPRC)

Primary disk

Secondary disk

subsystems

subsystems

Figure 7-8 GDPS/PPRC (no extended distance RPQ)

All critical data resides on storage subsystems in site 1 (the primary copy of data) and is mirrored to site 2 (the secondary copy of data) via PPRC synchronous remote copy.

GDPS/PPRC is capable of the following attributes:

￿Continuous availability

￿Near-transparent disaster recovery

￿Recovery Time Objective (RTO) less than an hour

￿Recovery Point Objective (RPO) of zero (optional)

￿Protects against localized area disasters

GDPS/PPRC HyperSwap

The GDPS/PPRC HyperSwap function is designed to broaden the continuous availability attributes of GDPS/PPRC by extending the Parallel Sysplex redundancy to disk subsystems. The HyperSwap function can help significantly reduce the time needed to switch disks between sites and the time to switch sites. GDPS/PPRC HyperSwap provides the ability to transparently switch all primary PPRC disk subsystems with the secondary PPRC disk subsystems for a planned or unplanned reconfiguration, as shown on Figure 7-9.

Chapter 7. Sysplex functions 171

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IBM 990 manual GDPS/PPRC HyperSwap, ZSeries
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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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