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10-4 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
Analyzing Connection Problems
10
3. Storage information:
• Disk/tape type
• Disk/tape firmware level
• Controller type
• Controller firmware level
• Configuration settings
• Storage software (such as EMC Control Center, Veritas SPC, etc.)
Analyzing Connection Problems
If a host is unable to detect its target (for example, a storage or tape device), you should begin
troubleshooting the problem in the middle of the data path. Determine if the problem is above or below
the starting point, then continue to divide the suspected problem path in half until you can pinpoint the
problem.
Use the following procedures to analyze the problem:
To check the logical connection
1. Enter the switchShow command.
2. Review the output and determine if the device is logically connected to the switch:
• A device that is logically connected to the switch will be registered as an F_Port or L_Port.
• A device that is not logically connected to the switch will be registered as something other than
an Nx_Port.
3. If the missing device is logically connected, proceed to the next troubleshooting procedure (“To
check the Simple Name Server (SNS)” on page 10-7.
4. If the missing device is not logically connected, check the device and everything on that side of the
data path. Also refer to “Correcting Link Failures” on page 10-19.
This includes all aspects of the host OS, the driver settings and binaries, the device Basic Input
Output System (BIOS) settings, the SFP, the cable going from the switch to the device, the SFP on
the switch side of that cable, and all switch settings related to the device. Refer to “To check for a
loop initialization failure” on page 10-20 as the next potential trouble spot.
To check for fibre channel connectivity problems
1. Enter the fcPing command, which:
• Checks the zoning configuration for the two ports specified.
• Generates an ELS (Extended Link Service frame) ECHO request to the source port specified
and validates the response.
• Generates an ELS ECHO request to the destination port specified and validates the response.