Coupling facility peer channels (TYPE=CFP, TYPE=CBP, TYPE=ICP, TYPE=CIB, TYPE=CL5, or TYPE=CS5)

You can configure a CFP, CBP, ICP, CIB, CL5, and CS5 channel path as:

  • An unshared dedicated channel path to a single LP
  • An unshared reconfigurable channel path that can be configured to only one LP at a time but that can be dynamically moved to another LP in the same CSS by channel path reconfiguration commands
  • A shared channel path that can be concurrently used by the LPs in the same CSS to which it is configured.
  • A spanned channel path that can be concurrently used by LPs in more than one CSS. Some CPCs do not support spanned CFP, CBP, and ICP channel paths. See Keyword applicability for channel paths and functions.

Coupling facility peer channel paths can be shared by many ESA LPs and only one coupling facility LP at the same time. CFP, CBP, CIB, CL5, and CS5 channel paths are used when connecting two CPCs that support coupling facility peer channel paths. ICP channel paths are used when connecting coupling facility and ESA LPs on the same CPC. CFP channel paths are defined for ISC-3 links. CBP channel paths are defined for ICB-3 and ICB-4 links. CIB channel paths are defined for InfiniBand links. CS5 channel paths are defined for Integrated Coupling Adapter links. CL5 channel paths are defined for Coupling Express LR adapter links. Each CFP, CBP, ICP, CIB, CL5, and CS5 channel path assigned to a coupling facility control unit should have seven, eight, or 32 devices defined.