Brocade Fabric OS Troubleshooting and Diagnostics Guide v6.2.0 (53-1001187-01, April 2009)

90 Fabric OS Troubleshooting and Diagnostics Guide
53-1001187-01
Troubleshooting FICON
11
Symptom Packets are being dropped between two FICON units.
Probable cause and recommended action
When planning cable the following criteria must be considered.
• Distance considerations
• Fibre 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.
Troubleshooting FICON
This section provides information gathering and troubleshooting techniques necessary to fix your
problem.
General information to gather for all cases
The following information needs to be gathered for all FICON setups:
• The standard support commands (portLogDump, supportSave, supportShow) or the Fabric
Manager Event Log.
By default, the FICON group in the supportShow output is disabled. To enable the capture of
FICON data in the supportShow output, enter the supportShowCfgEnable ficon command.
After you get confirmation that the configuration has been updated, the following will be
collected and appear in the output for the supportShow command:
- ficonCupShow fmsmode
- ficonCupShow modereg
- ficonDbg dump rnid
- ficonDbg log
- ficonShow ilir
- ficonShow lirr
- ficonShow rlir
- ficonShow rnid
- ficonShow switchrnid
- ficuCmd dump -A
• Check to make sure supportshow is configured for FICON.
• Execute “supportsave” to capture supportshow, errdumpall, and any RAS logs. Only execute
this on one logical switch in each chassis as data will be collected for both logical switches.
There is a known defect that will cause the supportshow data to be invalid if this is done
simultaneously across both logical switches.