6947ch07.fm

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

It includes a sample migration plan, describes how to monitor this new Parallel Sysplex technology and how to determine its cost/benefit in your environment, and gives setup recommendations.

7.4 Geographically Dispersed Parallel Sysplex

IBM Installation Services for GDPS is a total end-to-end solution that manages availability within a site and across multiple sites. It provides the automation to manage not only unplanned exception conditions, but also the many planned exception conditions that are faced as a part of normal everyday processing in any I/T environment. The GDPS solution can be tailored to specific Business Continuance requirements, and is based on either the synchronous Peer to Peer Remote Copy (PPRC) or the asynchronous Extended Remote Copy (XRC).

GDPS also supports the Peer-to-Peer Virtual Tape Server (PtP VTS) form of remote copying tape data. By extending GDPS support to data resident on tape, the GDPS solution is designed to provide continuous availability and near transparent business continuity benefits for both disk- and tape-resident data. Enterprises should no longer be forced to develop and utilize processes that create duplex tapes and maintain the tape copies in alternate sites.

GDPS is application independent and is enabled by means of key IBM technologies and architectures:

￿Parallel Sysplex

￿Tivoli® Netview for z/OS or OS/390

￿System Automation for z/OS or OS/390

￿Enterprise Storage Server®™ (ESS)

￿Peer-to-Peer Virtual Tape Server (PtP VTS)

￿Optical Dense or Coarse Wavelength Division Multiplexer

￿PPRC (Peer-to-Peer Remote Copy) architecture

￿XRC (Extended Remote Copy) architecture

￿Virtual Tape Server Remote Copy architecture

All GDPS images are running GDPS automation based upon Tivoli Netview for z/OS or OS/390 and System Automation for z/OS or OS/390. Each image will monitor the base or Parallel Sysplex cluster, Coupling Facilities, and storage subsystems; and maintain GDPS status. GDPS automation can coexist with an enterprise existing automation product.

For more detailed information on GDPS, see the white paper GDPS: The e-business Availability Solution, GF22-5114 at:

http://www.ibm.com/servers/eserver/zseries/library/whitepapers/gf225114.html

7.4.1 GDPS/PPRC

PPRC is a hardware solution that synchronously mirrors data residing on a set of disk volumes, called primary volumes in Site 1, to secondary disk volumes on a second system at Site 2. Only when the application site storage subsystem receives write complete from the recovery site storage subsystem is the I/O signaled as completed.

The physical topology of a GDPS/PPRC consists of a base or Parallel Sysplex cluster spread across two sites (site 1 and site 2), with one or more z/OS and/or OS/390 systems at each sites. The maximum distance between sites is 100 km (62 miles), using the GDPS/PPRC Cross-site Extended Distance for Parallel Sysplex RPQ (see, “GDPS/PPRC Cross-site extended distance for Parallel Sysplex” on page 173). Without the extended distance RPQ, the distance between sites is up to 40 km, as shown in Figure 7-8. The multisite Parallel

170IBM eServer zSeries 990 Technical Guide

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IBM 990 manual Geographically Dispersed Parallel Sysplex, Gdps/Pprc
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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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