IBM 990 - Manual (Page 74)

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zSeries 990 Technical Guide
2.2.7 Model configurations
The z990 server model nomenclature is based on the number of PUs available for customer
use in each configuration. Four models of the z990 server are available:
IBM 2084 model A08: Eight PUs are available for characterization as CPs, IFLs, ICFs,
zAAPs (up to four), or additional SAPs.
IBM 2084 model B16: 16 PUs are available for characterization as CPs, IFLs, ICFs, zAAPs
(up to eight), or additional SAPs.
IBM 2084 model C24: 24 PUs are available for characterization as CPs, IFLs, ICFs,
zAAPs (up to 12), or additional SAPs.
IBM 2084 model D32: 32 PUs are available for characterization as CPs, IFLs, ICFs,
zAAPs (up to 16), or additional SAPs.
When a z990 order is configured, PUs are selected according to their intended usage. They
can be ordered as:
CP The Processor Unit purchased and activated supporting the z/OS,
OS/390, z/VSE, VSE/ESA, z/VM, and Linux operating systems, which
can also run the Coupling Facility Control Code (CFCC).
Unassigned CP A Central Processor purchased for future use as a CP. It is offline and
unavailable for use.
IFL The Integrated Facility for Linux (IFL) is a Processor Unit that is
purchased and activated for exclusive use by the z/VM and Linux
operating systems.
Unassigned IFL A Processor Unit purchased for future use as an IFL. It is offline and
unavailable for use.
ICF A Processor Unit purchased and activated for exclusive use by the
Coupling Facility Control Code (CFCC).
zAAP A Processor Unit purchased and activated for exclusive use to run
Java code under control of z/OS JVM.
Additional SAP The Optional System Assist Processor (SAP) is a Processor Unit that
is purchased and activated for use as a SAP.
Unassigned CPs are purchased PUs with the intention to be used as CPs, and usually have
this status for software charging reasons. Unassigned CPs do not count in establishing the
MSU value to be used for MLC software charging, or when charged on a per Processor Unit
basis.
Unassigned IFLs are purchased IFLs with the intention to be used as IFLs, and usually have
this status for software charging reasons. Unassigned IFLs do not count in establishing the
charge for either z/VM or Linux.
This method prevents RPQ handling in case a temporary downgrade is required. When the
capacity need arises, the unassigned CPs and IFLs can be assigned nondisruptively.
Upgrades
Concurrent CP, IFL, ICF, or zAAP upgrades are done within a z990 model. Concurrent
upgrades require PU spares. PU spares are PUs that are
not the two standard spares on
each MCM and are not characterized as a CP, IFL, ICF, zAAP, or SAP.