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

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