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FICON Cascading
Best Practices
A successful FICON-cascaded SAN environment requires a set of
best practice conventions as follows:
1. Connect fabric elements - Establish one or more ISLs between
cascaded directors of fabric switches as follows:
a. Ensure fabric elements are defined to the SAN management
application. If the elements must be defined, refer to the
appropriate switch or director installation manual for
instructions.
b. Ensure the preferred Domain_ID for each director or switch is
unique and does not conflict with the ID of another fabric
element.
c. Ensure the R_A_TOV and E_D_TOV values for fabric
elements are identical.
d. Route multimode or singlemode fiber-optic cables
(depending on the type of transceiver installed) between
customer-specified E_Ports at each fabric element.
2. Verify operation of local FICON applications - Ensure the ISL
connection(s) do not disrupt fabric element operation nor
disrupt local FICON (non-cascaded) traffic. Perform this step
at each director or switch.
a. At the SAN management application's physical map,
right-click the director or switch product icon, then select
Element Manager from the pop-up menu. The Element
Manager application opens.
b. If required, click the Hardware tab. The Hardware View
(Figure
2-7) displays. Verify the status bar at the bottom left
corner of the window displays a green circle, indicating
director or switch status is operational. If a problem is
indicated, go to MAP 0000: Start MAP in the product- specific
Installation and Service Manual.
c. Have the customer verify operation of non-cascaded FICON
applications at each director or switch.
3. Verify ISL operation - Ensure ISL connectivity between fabric
elements. Perform this step at each director or switch.
a. At the Element Manager application's Hardware View, double-
click the graphical E_Port connector used for the ISL. The Port
Properties dialog box displays.
Planning Considerations for Fibre Channel Topologies
Planning Considerations for Fibre Channel Topologies
3
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