IBM eServer zSeries 900 Technical Guide

Chapter 5. Sysplex functions 179

Regardless of the number of images and the underlying hardware, the Parallel Sysplex

cluster appears as a single system image from several perspectives:

򐂰 Data access, allowing dynamic workload balancing and improved availability

򐂰 Dynamic transaction routing, providing dynamic workload balancing and improved

availability

򐂰 End-user interface, allowing access to an application as opposed to a specific image

򐂰 Operational interfaces that allow Systems Management across the Sysplex from a single

point

5.1.2 Parallel Sysplex summary

Through this state-of-the-art cluster technology, the power of multiple z/OS and/or OS/390

images can be harnessed to work in concert on common workloads. The zSeries Parallel

Sysplex cluster takes the commercial strengths of the z/OS or OS/390 platform to improved

levels of system management, competitive price/performance, scalable growth, and

continuous availability.

5.2 Coupling Facility support

Described here are the different forms of Coupling Facilities (CFs) supported on z900

servers. The z900 general purpose and capacity models support both Central Processors

(CPs) and Internal Coupling Facility (ICF) processors. The z900 Model 100 supports ICFs

and SAPs only.

For additional details regarding CFs, see the paper

Coupling Facility Configuration Options,

GF22-5042, available from the Parallel Sysplex website:

http://www.ibm.com/servers/eserver/zseries/pso/

5.2.1 Coupling Facility Control Code (CFCC)

Supported CFCC levels

Table 5-1 summarizes the CFCC CFLEVELs supported on the z/900 servers.

Table 5-1 CFCC levels supported on a z900

CFLEVEL Minimum software levels

a

CFLEVEL 12

Requires z900 EC J11207 Driver 3G MCL 006

򐂰 64 bit support, removal of the 2GB line

򐂰 System Managed CF Structure Duplexing

򐂰 Support for Message Time Ordering

򐂰 z/OS 1.4 and above is required to fully exploit

the functions.

򐂰 z/OS 1.2 and above with APAR OW41617 is

minimum for System Managed CF Structure

Duplexing.

򐂰 All supported levels of z/OS and OS/390 with

PTFs can be used with CFLEVEL 12, but

may not

take advantage of the

enhancements.

CFLEVEL 11 - only for G5/G6 servers

Requires G5/G6 Driver 26 and latest MCL

– System Managed CF Structure

Duplexing

򐂰 z/OS 1.2 and above with APAR OW41617 is

minimum for System Managed CF Structure

Duplexing