Overview of the CHPID Mapping Tool

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The CHPID Mapping Tool maps the I/O ports of your hardware to the CHPID definitions in your IOCP source statements. Such mapping helps to avoid connecting critical paths to single-points-of-failure. The CHPID mapping tool can save you time by minimizing or eliminating changes when you get new hardware or upgrade existing hardware.

The CHPID Mapping Tool supports the following:
  • IBM z16 TM / IBM LinuxONE Rockhopper 4 - Models A02/LA2/AGZ/AGL
  • IBM z16 / IBM LinuxONE Emperor 4 - Models A01/LA1
  • IBM z15™ (z15) / IBM LinuxONE III - Models T02 and LT2
  • IBM z15 (z15) / IBM LinuxONE III - Models T01 and LT1
  • IBM z14® (z14) / IBM LinuxONE Rockopper II (Rockhopper II)
  • IBM z14 (z14) / IBM LinuxONE Emperor II (Emperor II)
  • IBM z13s® (z13s®) / IBM LinuxONE Rockhopper (Rockhopper)
  • IBM z13® (z13®) / IBM LinuxONE Emperor (Emperor)
  • IBM® zEnterprise® BC12 (zBC12).
  • IBM zEnterprise EC12 (zEC12).
  • IBM zEnterprise 196 (z196) and IBM zEnterprise z114 (z114).
  • IBM System z10® Enterprise Class (z10 EC) and IBM System z10 Business Class (z10 BC)
  • IBM System z9® Enterprise Class (z9® EC) and IBM System z9 Business Class (z9 BC)

You can use the CHPID Mapping Tool for a new build, an upgrade to, or an MES for any supported processor. You can also use it to change an already installed machine after hardware upgrades increase the number of STI or InfiniBand links or channels.

No default CHPIDs are assigned to ports of z10 EC, z10 BC, z9 EC, or z9 BC processors. CHPIDs are assigned in the IOCP source file and mapped to the physical channel paths (PCHIDs). Using the CHPID mapping tool helps with these assignments. When the resulting IOCDS is loaded during activation of the CPC hardware, the CHPID to PCHID assignments become part of the configuration.

Using the CHPID Mapping Tool:
  • You can maintain the existing IOCP definitions for CHPID assignments to control units. Using the tool minimizes any changes that you might need to make to in-house documentation, cable labels, and the hardware configuration definitions (HCDs).
  • You can implement a numbering scheme for associating different device types to ranges of CHPID addresses. For example, you might want to have all DASD devices within a certain CHPID range.
  • You do not need to change the existing control units and wiring.

For purposes of this document, consider a CHPID assignment as a logical value that is associated with a physical entity that is called a PCHID. A PCHID can be a specific port on an ESCON card, OSA-Express card, FICON® card, ICB, ISC link, and so on. A CHPID is merely an arbitrary number defined within the IOCP. The mapping tool relates that logical assignment to a PCHID location in the machine.