Chapter 2. zSeries 900 system structure 35
2C1 through 216
If there are IFLs or ICFs processors in a configuration, the sum of the number of those
processors must be taken into account when planning for concurrent upgrades.
Upgrades from z900 Models 1C1 through 1C9
cannot be done concurrently to Models 2C1
through 2C9 or to Models 210 and above, as this upgrade requires the non-turbo 20-PU MCM
replacement by the turbo 20-PU MCM.
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.
More information about CBU is in Section 6.4, “Capacity BackUp (CBU)” on page 216.
2.4.3 Coupling Facility model
There is only one z900 Coupling Facility server: the model 100. It can have only ICFs and
SAPs. The z900 Model 100 is designed to run only Control Facility Control Code (CFCC).
It uses the 12-PU MCM and can have up to 9 ICF processors. There is no CBU feature
available on the z900 model 100, as CBU applies only to CPs.
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