6947ch07.fm Draft Document for Review April 7, 2004 6:15 pm
154 IBM eServer 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
Shown also 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 , allo wing highly reliab le, 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.
򐂰z/OS and OS/390 software components allow new software releases to coexist with lower
levels of that software component to facilitate rolling maintenance.
DASD DASD DASD
CF02
ICF
CF01
ICF
ESCON / FICON
Sysplex Timer
z/OS
z/OS
ICB-3
ICB-4
ICB-3
IC
ISC-3
ISC-3
ISC-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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