Test configurations

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For the connectivity between the z/VM® members several different ISFC logical link configurations were tested.

A principal distinction between two categories of ISFC logical link configurations was made:

  • ISFC logical link configurations with "straight" FCTC connections (described in ISFC logical link configurations with "straight" FCTC connections)

    The rationale for "straight" FCTC connections was the idea that FICON® channels might be able to optimize the data flow – at least to some extent – by not passing all data through the FICON switch.

  • ISFC logical link configurations with "crossed" FCTC connections (described in ISFC logical link configurations with "crossed" FCTC connections)
    The rationale for “crossed” ISFC logical link configurations were the ideas
    • That send operations initiated on one FICON channel resulted in receive operations on a different FICON channel, and
    • That the data flow had to pass through the switch in every case.

Any kind of ISFC logical link configuration is achieved by configuring only such FCTC devices into the ISFC logical link configuration that previously in the IOCDS were configured to connect the LPARs respectively.