Common Ficon Issues - Brocade Communications Systems StoreFabric SN6500B Administrator's Manual

5

Common FICON issues

Common FICON issues

Any information you need to verify that FICON has been set up correctly can be found in the
2, "Administering FICON Fabrics"
Symptom Cascading: No path – Entry Link is ".."
Probable cause and recommended action
This typically occurs when one or more of the required high integrity features for cascading have
not been met. Check the following:
•
•
Symptom Path to a device does not come online
Probable cause and recommended action
Make sure binding or zoning does not prevent the connection. Validate the following with the data
center's system programmer:
•
•
•
Symptom Packets are being dropped between two FICON units.
Probable cause and recommended action
When planning cable needs, the following criteria must be considered:
• Distance considerations
• Fiber Optics Sub Assembly (FOSA) type (SW or LW)
• Cable specifications (SM or MM)
• Patch Panel Connections between FOSA ports (link loss .3-5 dB per)
• Maximum allowable link budget (dB) loss
From a cabling point of view, the most important factor of a Fibre Channel link is the selection of
the Fibre Optical Sub Assembly (FOSA) and matching cable type, to support the required distance.
Both ends of the optical link must have the matching FOSA (SFP) types.
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Review each step in "Configuring switched point-to-point FICON"
cascaded FICON" on page 25 and validate that all features are configured properly.
Validate that CUP is online for each Backbone or switch in the fabric with the data center's
system programmer.
Correct switch addresses (not switch IDs) are used in Link statements. Remember that the
switch address is the domain ID converted to hex and may have an offset.
The Switch ID, used in the CHPID statements, was defined with the correct switch address.
All addressing (LINK statements) uses 2-byte addressing on the channel if 2-byte addressing
has been previously used on that channel. This is necessary even when the specified path is
not cascaded.
or Chapter 3, "Configuring FICON
Chapter
CUP".
on page 20 and "Configuring
FICON Administrator's Guide
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