72 IBM z13s Technical Guide
2.7.2 Concurrent PU conversions
Assigned CPs, assigned IFLs, and unassigned IFLs, ICFs, zIIPs, and SAPs can be converted
to other assigned or unassigned feature codes.
Most PU conversions are nondisruptive. In exceptional cases, the conversion can be
disruptive, such as when a Model N20 with six CPs is converted to an all IFL system. In
addition, an LPAR might be disrupted when PUs must be freed before they can be converted.
Conversion information is summarized in Table 2-11.
Table 2-11 Concurrent PU conversions
2.7.3 Model capacity identifier
To recognize how many PUs are characterized as CPs, the store system information (STSI)
instruction returns a model capacity identifier (MCI). The MCI determines the number and
speed of characterized CPs. Characterization of a PU as an IFL, an ICF, or a zIIP is not
reflected in the output of the STSI instruction because characterization has no effect on
software charging. For more information about STSI output, see “Processor identification” on
page 351.
Important: Upgrades from z114 and zBC12 are disruptive.
To
From
CP IFL Unassigned
IFL
ICF zAAP zIIP SAP
CP - Yes Ye s Yes Yes Ye s Ye s
IF L Ye s - Yes Ye s Ye s Yes Ye s
Unassigned IFL Yes Yes - Yes Yes Yes Yes
ICF Yes Yes Yes - Yes Yes Yes
zAAP Yes Yes Yes Yes - Yes Yes
z I I P Ye s Ye s Ye s Ye s Ye s - Ye s
S A P Ye s Ye s Ye s Ye s Ye s Ye s -
Capacity identifiers: Within a z13s server, all CPs have the same capacity identifier.
Specialty engines (IFLs, zAAPs, zIIPs, and ICFs) operate at full speed.
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