Ficon cup restrictions – Brocade FICON Administrator’s Guide (Supporting Fabric OS v7.3.0) User Manual
Page 54
FICON Management Server mode (FMS mode) must be enabled on the switch to enable CUP
management features. For more information, refer to
on page 56.
FIGURE 16 FICON CUP
The figure above is a simplified representation of a FICON environment and how CUP fits into that
environment. FICON switches with FMS enabled use port address "FE" as the embedded internal port
for host connectivity to the CUP, and port address "FF" is reserved. Therefore, addresses "FE" and
"FF" cannot be used for assignment to physical ports when FMS is enabled. For more information,
refer to
In a FICON environment, only one RMF logical partition (LPAR) should be configured to poll the CUP
for port statistical counter data to minimize contention for the CUP device. Host contention for access
to the CUP can lead to missing interrupts, potentially causing the host to box the device. It is a best
practice to have more than one CHPID defined as a path to the CUP to ensure redundancy for host-to-
CUP connectivity.
FICON CUP restrictions
The following restrictions apply to Brocade FICON switches having at least 256 ports when FMS mode
is enabled and when host applications are used for in-band monitoring and management of the switch:
•
FICON Management Server mode (FMS mode) must be enabled on the switch to enable CUP
management features. When this mode is enabled, Fabric OS prevents configuration requests
from out-of-band management interfaces from interfering with host in-band configuration requests
by serializing access to switch parameters.
FICON CUP restrictions
52
FICON Administrator's Guide
53-1003144-01