Specifications

Mixed configuration
Figure 44 on page 77 shows an example of an S/390 or zSeries host system with
one FICON channel 1 and one FICON director 2 through a channel-path group
3 and FICON host adapter 4 to the ESS. Figure 44 on page 77 also shows an
S/390 or zSeries host system with one FICON channel 1 and one ESCON
director with a FICON bridge 6 through a channel-path group 3 and two
ESCON adapters 5.
Figure 44 on page 77 shows that one FICON bridge was removed from the FICON
configuration. The FICON channel that was connected to that bridge is reconnected
to the new FICON director. The ESS FICON adapter is connected to this new
director. The channel-path group was changed to include the new FICON path. The
channel-path group is a mixed ESCON and FICON path group. I/O operations
continue to the ESS devices across this mixed path group. Access to the ESS
devices is never interrupted because all the actions are nondisruptive.
Notes:
1. The configuration in Figure 44 on page 77 is supported for migration only.
2. Do not use this configuration for an extended period.
3. IBM recommends that you migrate from a mixed channel-path group
configuration to an all FICON channel-path group configuration.
S/390 or
zSeries Host
4 4
ESS
1 1
3
4 4
22
S009067
Figure 43. Example of how to configure a FICON bridge from an S/390 or zSeries host
system to an ESS
76 ESS Host Systems Attachment Guide