Consider the following points regarding upgrades: You can upgrade a z13s (2965) server and preserve the CPC serial number (S/N). The I/O  cards can also be carried forward (with certain restrictions) to the z14 ZR1 server. For frame  roll MES from z13s to z14 ZR1, new frames are shipped. New PCIe+ I/O drawers are  supplied with the MES for z13s to replace the PCIe I/O drawers. Important:  Upgrades from IBM z13s are always disruptive. Assigned CPs, assigned IFLs, and unassigned IFLs, ICFs, zIIPs, and SAPs can be converted  to other assigned or unassigned PU feature codes.  Most conversions are nondisruptive. In exceptional cases, the conversion might be disruptive;  for example, when a model  ZR1  with 6 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 listed in Table 2-9. GLYPH<SM590000> Upgrade from a z14 LR1 to a z14 ZR1  is  supported GLYPH<SM590000> Upgrade from z14 ZR1 to z14 LR1 is  not  supported GLYPH<SM590000> Upgrade from z14 ZR1 to z14 M0x is   supported GLYPH<SM590000> Upgrade from z14 LR1 to z14 LM1 is  not  supported 2.7.4 Concurrent PU conversions 2.7.5 Model capacity identifier Model capacity identifiers To\ From  CP   IFL  Unassigned  IFL  ICF  zIIP Additional SAP CP - Yes Yes Yes Yes Yes IFL Yes - Yes Yes Yes Yes Unassigned IFL  Yes Yes - Yes Yes Yes ICF Yes Yes Yes - Yes Yes zIIP Yes Yes Yes Yes - Yes Additional SAP Yes Yes Yes Yes Yes - Table 2-9 Concurrent PU conversions 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, ICF, or 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 321. Capacity identifiers:  Within a  z14 ZR1  server, all CPs feature the same capacity identifier.  Specialty engines (IFLs, zIIPs, and ICFs) operate at full speed. All model capacity identifiers feature a related MSU value that is used to determine the  software license charge for MLC software, as listed in Table 2-10 on page 54. Chapter 2. Central processor complex hardware components  53