IBM eServer zSeries 990 Technical Guide

62 IBM ^ 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.

Chapter 2. System structure and design 63

If the upgrade request cannot be accomplished within the given model, a model upgrade is

required. A model upgrade will cause the addition of one or more books to accommodate the

desired capacity. Additional books can be installed concurrently.

Upgrades from one IBM 2084 model to another are concurrent and mean that one or more

books are added. Table 2-5 shows the possible model upgrades within the IBM 2084 model

range.

Table 2-5 z990 upgrade paths

Upgrade paths from IBM 2064 models (z900) offer a virtually unrestricted upgrade capability.

Upgrades from any z900 to any z990 server are supported (with the exception of the IBM

2064 model 100, which can only can be upgraded to another z900 model).There are also no

upgrade paths from IBM 9672 G5 and G6 models, nor is there an upgrade path from the IBM

2066 models (z800).

There are limited upgrade paths from the 2086-A04 model (z890) to the 2084-A08 model

(z990). For details, contact your IBM representative or IBM Business Partner.

Figure 2-17 shows all upgrade paths from z900 to z990 models, and all upgrade paths within

the z990 model range.

Figure 2-17 Supported z900-to-z990 upgrade paths

Software models

In order to recognize how many PUs are characterized as a CP, the STSI instruction returns a

value that can be seen as a software model number to determine the number of assigned

CPs. Characterization of a PU as an IFL, an ICF, or an zAAP is not reflected in the output of

the STSI instruction, since they have no effect on MLC software charging.

z990 Models 2084-A08 2084-B16 2084-C24 2084-D32

2084-A08 - X X X

2084-B16 - - X X

2084-C24 - - - X

2084-D32----

z900 z990

100

101-109

1C1-116

2C1-216

A08

B16

C24

D32