EMC Symmetrix DMX-3, Product Manual

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Supported mainframe features 239
Mainframe Features and Support
Same switch vendors are required for a Cascaded configuration. The
EMC and IBM branded McDATA and INRANGE switches are
supported in pairs. To support Cascading, each vendor requires
specific models, hardware and software features, configuration
settings, and restrictions. Specific IBM CPU models, operating system
release levels, channel hardware, and microcode levels are also
required.
FICON Open Systems Intermix configurations
Open Systems Intermix allows separate FICON zones to be defined
within new or existing open systems switches. These switches can
also be Cascaded to further enhance connectivity and remote backup
and recovery. The EMC and IBM branded McDATA and INRANGE
switches are supported. To support Open Systems Intermix, each
vendor requires specific models, hardware and software features,
configuration settings, and restrictions. Specific IBM CPU models,
operating system release levels, channel hardware, and microcode
levels are also required.