ICP246I LINK ADDRESS xxxx ALREADY USED FOR SWITCH yy BY CONTROL UNIT zzzz

Explanation

One of the two following conditions exists:
  • You have assigned both a parallel and an ESCON control unit to the same switch.link (yy.xx). You cannot attach parallel and ESCON control units to the same port on an ESCON Director.
  • You have assigned two ESCON or FICON® control units to the same switch.link (yy.xx or yy.xxxx). You can define ESCON or FICON control units to the same port on an ESCON or FICON Director only if the channel paths are all the same type or a mix of CNC and FCV channel paths and you are trying to define one of the following:
    • ESCON CTC communications
    • FICON CTC communications
    • A single physical control unit as multiple control units for use by different logical partitions (LPs)
    • A control unit that supports logical addressing (CUADD keyword)
Note: Two control units can never have the same path (css.chpid.link.cuadd) for a given channel path.

System action

IOCP continues to validate and check the syntax of the remaining statements. However, it does not generate an IOCDS and it does not produce configuration reports.

Programmer response

For condition 1, do one of the following:
  • Attach one of the control units to a different director or link.
  • Change the types of channel paths to the control units so that they are all parallel or all CNC, CTC, and FCV.
For condition 2, do one of the following:
  • If you are defining two physical control units, correct the switch number or link address for one of the control units so that the control units attach to different ESCON or FICON Directors or different link addresses on the same director.
  • If you are defining ESCON CTC or FICON CTC communications, ensure that both control units are defined as ESCON CTC or FICON CTC control units (see IOCP definitions) and that all channel paths are the same type or a mix of CNC and FCV channel paths.
  • If you are defining a single physical control unit as multiple control units for use by different logical partitions (LPs), ensure that the control units have the same unit address ranges, the channel paths in each control unit are all the same type or a mix of CNC and FCV channel paths, and none of the paths attaching to the different control units belongs to the same logical partition. The logical partition intersection test is based on the initial access lists of the channel paths attaching to the control units.
  • If you are defining a control unit that supports logical addressing, specify the unique logical addresses that your control unit supports by using the CUADD keyword on each of the CNTLUNIT statements, and ensure that the channel paths in each control unit are all the same type.
Note: Not all ESCON and FICON control units support logical addressing.