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Page 168: Figure 7-1 sysplex hardware overview

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IBM

zSeries 990 Technical Guide

7.1 Parallel Sysplex

Figure 7-1 illustrates the components of a Parallel Sysplex as implemented within the zSeries
architecture. Shown is a z900 model 2xx ICF (CF01) connected to two z990 servers running
in Sysplex. There is a second Integrated Coupling Facility (CF02) defined within one of the
z990s, containing SysPlex logical partitions running z/OS.

Figure 7-1 Sysplex hardware overview

Also shown is the required connection between the Coupling Facility (CF01) defined on a
z900 turbo model (2064-2xx) or any z990 Server, and the Sysplex Timer, to support Message
Time Ordering.

7.1.1 Parallel Sysplex described

Parallel Sysplex technology is an enabling technology, allowing highly reliable, redundant, and
robust zSeries technologies to achieve near-continuous availability. A Parallel Sysplex is
comprised of one or more z/OS and/or OS/390 operating system images coupled via one or
more Coupling Facilities. The images can be combined together to form clusters. A properly
configured Parallel Sysplex cluster is designed to maximize availability. For example:

Hardware and software components provide for concurrent planned maintenance, like
adding additional capacity to a cluster via additional images, without disruption to
customer workloads.

Networking technologies that deliver functions like VTAM Generic Resources, Multi-Node
Persistent Sessions, Virtual IP Addressing, and Sysplex Distributor to provide
fault-tolerant network connections.

DASD

CF02

ICF

CF01

ICF

ESCON / FICON

Sysplex Timer

z/OS

B-

ICB-4

B-3

C-

ISC-3

C-3

IBM z990

IBM z900

Model 2xx

IBM z990

Sysplex

LPARs

Sysplex

LPARs

Required

connection from

CF on z900 2xx

or any z990 CPC

to Sysplex Timer

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