IBM eServer zSeries 900 Technical Guide

6 IBM eServer zSeries 900 Technical Guide

Figure 1-3 Example of a multisystem server

The MCM on the z900 offers flexibility in enabling spare PUs via the Licensed Internal Code

Configuration Control (LICCC) to be used for a number of different functions. These are:

򐂰 A Central Processor (CP)

򐂰 An Integrated Facility for Linux (IFL)

򐂰 An Internal Coupling Facility (ICF)

򐂰 A System Assist Processor (SAP)

The number of CPs and SAPs assigned for particular general purpose models depends on

the configuration. A

standard configuration has the standard number of SAPs and a modified

configuration has more than the standard number of SAPs.

The number of spare PUs is dependent on how many CPs, SAPs, ICFs and IFLs are present

in a configuration. All z900 configurations have at least one spare PU.

1.3.2 Memory

64-bit addressing

The implementation of the 64-bit z/Architecture eliminates any bottlenecks associated with

lack of addressable memory by making the addressing capability virtually unlimited

(16 exabytes).

Expanded Storage (ES) is still supported under 31-bit architecture. For 64-bit z/Architecture,

ES is supported by z/VM and guest systems running under z/VM. It is not supported by z/OS.

zSeries

Platform

Appl.+DB

ERP

z/VM

Linux

Linux

Appl

trans-

action

WebSphere

e-commerce

JVM

business

appl.

z/OS

trans-

action

Siebel

Java

Java

&

&

EJB

EJB

Appl*

Appl*

Consolidate

Cluster/Parallel

File/Disk/Print

CICS

CICS

IMS

IMS

DL/I

DL/I

DB2

DB2

Linux