Cup Configuration Recommendations - Brocade Communications Systems StoreFabric SN6500B Administrator's Manual

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CUP configuration recommendations

The following are recommendations for setting up FICON CUP:
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FICON Administrator's Guide
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ATTENTION
Once FMS mode is enabled, you cannot bind FE/FF to any ports using either the portAddress
or wwnAddress commands.
The switch is advertised to the mainframe by the CUP as having a specific number of ports,
which is based on the hardware platform. The maximum supported switch size is 256 ports.
The addresses FE/FF are not components of the Allow/Prohibit Matrixes (as they are called in
the Brocade Network Advisor and Web Tools), because the Prohibit Dynamic Connectivity
Masks (PDCMs) for these two ports are defined architecturally and cannot be modified by the
user.
The Port Address Name for the internal FE port can be read by the host, and corresponds to
the switch name that is set for the switch. The switch name can be modified by the host, with
the limitation that the host can write EBCDIC characters that cannot be converted directly to
ASCII for display in the GUI or CLI management interfaces. Such characters will be converted to
periods for these displays.
Refer to Appendix A, "Platforms supporting FICON"
blades in various chassis products.
Addresses 0xFE and 0xFF are not available for external connections. Before enabling FMS
mode, you must manually disable physical ports associated with 0xFE and 0xFF if there is an
active device connected to these ports. If there is an active device connected to either of these
ports, Fabric OS will not enable FMS until either the port is disabled or the device is taken
offline (logs out of the switch). If there is no active device connected, these ports will
automatically be disabled when FMS enables. Because these ports are not available after
enabling FMS mode, you should first move any fiber connected to either of them to another
free port. For more information, refer to
Device Type: 2032
Use this type as the CUP "UNIT" type for the CNTLUNIT and IODEVICE statements in the IOCDS
or HCD. Although IBM has developed new machine types for switches, all Brocade Backbones
and switches regardless of model or manufacture should be configured as 2032.
Paths
Define at least two CHPIDs as paths to the CUP in the IOCDS Control Unit statement for the
switch to ensure redundancy for host connectivity.
RMF 74-7 statistics gathering
So as not to overwhelm the CUP, the recommended best practice in a sysplex environment is to
disable FICON switch statistics (RMF polling) on all but one host system that has inband
access to the CUP. If no FICON statement is specified, the system will gather switch statistics
by default so FICON switch statistics should be disabled on all but the system intended to
gather statistics.
Missing Interrupt Handler (MIH)
Set the MIHPTO to three minutes (180 seconds).
Control Unit Port overview
for details on FICON support for Brocade
"Disabling ports 0xFE and 0xFF"
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on page 38.
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