Specifications

FICON configuration
Figure 42 on page 75 illustrates how to remove the ESCON paths. The S/390 or
zSeries host has four ESCON channels 1 connected to two ESCON directors 6.
The S/390 or zSeries host system also has two FICON channels 2.
You can remove the ESCON adapters nondisruptively from the ESS while I/O
continues on the FICON paths. You can change the channel-path group 3
definition to include only the FICON director 4 paths to complete the migration to
the ESS with two FICON adapters 5.
You can retain the ESCON channels on the S/390 or zSeries host system so that
you can access other ESCON controllers. You can also keep the ESCON adapters
1 on the ESS to connect to other S/390 or zSeries hosts.
1
2
ESS
1 1 1
3
2
4 4
55
6
7 7
6 6 6
S/390 or
zSeries Host
S009065
Figure 41. Example of an ESCON configuration with added FICON channels
74 ESS Host Systems Attachment Guide