IBM eServer zSeries 900 Technical Guide

Chapter 2. zSeries 900 system structure 33

2.4 Model configurations

The z900 model nomenclature is based on the number of CPs available in each configuration.

So any z900 model designation always indicates how many CPs are presented, but it does

not say how many IFLs or ICFs processors, if any, are installed. The IFLs and ICFs are

optional features of a z900 model.

The z900 models are classified into the following groups:

򐂰 General purpose models: 101 to 109, 110 to 116, and 210 to 216

򐂰 Capacity models: 1C1 to 1C9 and 2C1 to 2C9

򐂰 Coupling Facility model: 100

Basically, the last digits indicate the number of CPs, the C indicates a Capacity model and the

first digit indicates the processor speed.

򐂰 Models 1

xx are non-turbo models.

򐂰 Models 2

xx are turbo models.

򐂰 Models

xCx are capacity models.

The z900 servers’

Machine Type is 2064. Using the machine type-model structure naming,

the z900 server model 101 is called 2064-101.

There are three possible MCM types:

򐂰 The 12-PU MCM with a 1.3 ns cycle time, used for z900 models 100 and 101 to 109

򐂰 The non-turbo 20-PU MCM with a 1.3 ns cycle time, used with z900 models 1C1 to 1C9

and 110 to 116

򐂰 The turbo 20-PU MCM with a 1.09 ns cycle time, used with models 2C1 to 2C9 and 210 to

216

Concurrent upgrades can only be done within a server model range having the same MCM

type. Processor upgrades (CPs, IFLs, or ICFs) that require an MCM-type replacement are

disruptive.

Table 2-3 on page 36 and Table 2-4 on page 37 show the configuration options for all z900

models. The Capacity models are shown in shaded areas on the tables.

2.4.1 General purpose models

There are twenty-three z900 general purpose models, with from one to sixteen CPs. Except

on the 16-CP models 116 and 216, all other models can have optional IFLs or ICFs (see

Table 2-3 and Table 2-4).

Concurrent upgrades can be done if an MCM-type replacement is not required. So upgrades

on models

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

򐂰 101 through 109

򐂰 110 through 116

򐂰 210 through 216

Processor concurrent upgrades require PU spares. If there are IFL or ICF processors on a

configuration, they reduce the number of spare PUs. As an example, consider a z900 model

103. From its 12 PUs, 3 are assigned as CPs and 2 as SAPs, resulting in 7 spare PUs. If a

model 103 configuration now includes 4 IFLs, the number of spares is reduced to 3 PUs. As