IBM eServer zSeries 900 Technical Guide

34 IBM eServer zSeries 900 Technical Guide

every z900 model configuration must have at least one spare PU, this model 103 with 4 IFLs

has only 2 PUs left for future concurrent upgrades, which can be CP, IFL, or ICF additions. So,

if more CPs would be required, the maximum concurrent upgrade allowed is up to the model

105, with 5 CPs.

Upgrades from z900 models 101 through 109

cannot be done concurrently to models 110

and above, as this upgrade requires:

򐂰 The 12-PU MCM replacement to the non-turbo 20-PU MCM

򐂰 Two additional memory cards

򐂰 Modular Cooling Unit (MCU) subsystem replacement

򐂰 One additional Distributed Converter Assembly (DCA)

Upgrades from z900 models 110 through 116

cannot be done concurrently to models 210

and above, as this upgrade requires the non-turbo 20-PU MCM replacement to the turbo

20-PU MCM.

Upgrades from z900 models 101 through 109

cannot be done concurrently to models 210

and above, as this upgrade requires:

򐂰 The 12-PU MCM replacement to the turbo 20-PU MCM

򐂰 Two additional memory cards

򐂰 Modular Cooling Unit (MCU) subsystem replacement

򐂰 One additional Distributed Converter Assembly (DCA)

z900 general purpose models can have CBU features. The number of CBU features available

on each model is shown on Table 2-3 and Table 2-4. The maximum number depends upon

the number of spare PUs available in a configuration. One CBU feature is required for each

“stand-by” CP processor.

More information about CBU is in 6.4, “Capacity BackUp (CBU)” on page 216.

2.4.2 Capacity models

There are eighteen z900 Capacity models.

They use a 20-PU MCM, have one to nine CPs, and all can have optional IFLs or ICFs. See

Table 2-3 and Table 2-4.

z900 Capacity models are appropriate choices when needed CBU results in models in which

the sum of CPs, IFLs and ICFs is 10 or more. CBUs can only add CPs, but a z900 model with

CBU features can also have IFLs and ICFs.

z900 Capacity models are also indicated for an initial configuration when growth expectations

will result in models having more than 9 processors, including CPs, IFLs, and ICFs.

They are also indicated even on some initial configurations where the required processor

capacity implies a turbo model.

z900 models 1C1 to 1C9 use the non-turbo 20-PU MCM and 4-bus memory required on

models 110 and up.

z900 models 2C1 to 2C9 use the turbo 20-PU MCM and 4-bus memory required on models

210 and up.

Upgrades on models

with no IFL or ICF can be nondisruptive within the following model

ranges:

򐂰 1C1 through 116