Fully redundant configuration

The previous channel redundant configuration does not provide for FICON® Director failure. Full redundancy can be achieved with two FICON Directors, each supporting a minimum CTC configuration. The number of shared FC channels required to allow any partition to communicate with any other partition is:

FC channels = 2xM
          where M = number of processor complexes

For unspanned FC channels that are shared on a processor complex that supports multiple logical channel subsystems, the value M above is equal to the total number of logical channel subsystems on the processor complexes.

Note: This is the same number of channels as the channel redundant configuration.

The number of unshared FC channels required to allow any partition to communicate with any other partition is:

FC channels = 4xn
          where n = number of processor complexes in basic mode 
                 or number of logical partitions in LPAR mode