2.6.1 Input/output configuration program 2.6.2 Worldwide Port Name Prediction Tool 2.6.3 Coupling Facility Structure Sizer (CFSizer) WWPN Persistence Note:  Verify ICP/IOCP version for z15 support. ICP IOCP Version 5 Release 5.0 or later is required for a z15 server. You can define the z15  configuration by using only IOCP. However, HCD is suggested because of its verification and  validation capabilities. By using ICP IOCP, it is possible to write an IOCDS in preparation for a  CPC upgrade. For more information about the changes and requirements for ICP IOCP, see  IBM Z  Input/Output Configuration Program User’s Guide for ICP IOCP , SB10-7172. The worldwide port name (WWPN) Tool for IBM Z Fibre Channel Protocol (FCP) Channels  helps prepare configuration files that are required or generated by the IBM Z platform when  FCP Channels are installed. In particular, this tool helps during the installation of new  systems and system upgrades. One of the most important configuration parameters are WWPNs, which uniquely identify  physical or virtual Fibre Channel ports. They are typically used in Fibre Channel Storage Area  Network (SAN) switches to assign the corresponding ports to zones of a SAN. They are used  in storage subsystems to grant access from these ports to specific storage devices that are  identified by logical unit numbers (LUNs). The capability of the WWPN Prediction Tool is extended to calculate and show WWPNs for  both virtual and physical ports before system installation. The WWPN Prediction Tool is available for download from IBM Resource Link and is  applicable to all FICON channels defined as CHPID type FCP (for communication with SCSI  devices) on z15. You can access the tool at this web page using your IBMid. The FCP WWPNs are determined based on the I/O serial number of the CPC, the IOCDS  configuration details (for NPIV WWPNs), and the PCHID values (for physical WWPNs). With  the introduction of the z13, WWPN Persistence configuration option has been introduced.  When FC 0099 (WWPN Persistence) is ordered as part of a new or upgraded configuration  for a z15, the I/O serial number part of the WWPN for the new z15 is the same serial number  as for the source machine configuration. For more information, see the Techdocs website. Moving to a new z15 means migrating to a higher Coupling Facility Control Code level (CFCC  level 24). If your existing CF data structures are adequately sized, and you want to know how  much these structures might need to grow to accommodate the same workload at the new  CFCC level, you can use the current structure sizes to calculate the new sizes. The CFSizer  Tool helps you evaluate the sizing of the CF structures. Use the CFSizer tool to plan the amount of storage that must be allocated for coupling facility  partitions more accurately. You can access the tool from the CFSizer page. Chapter 2. Planning considerations for CPC in PR/SM mode  13 8860ch02.fm Draft Document for Review September 23, 2019 1:36 am