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Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 1 Troubleshooting Overview
Troubleshooting Basics
• Is the subsystem configured for an N port?
Examine the FLOGI database on the two switches that are directly connected to the host HBA and
subsystem ports. Also, verify that both ports (attached to MDS-A and MDS-B) are members of the same
VSAN. If both devices are listed in the FCNS database then ISLs are not an issue.
In Fabric Manager, choose Tools > Ping or Tools > Traceroute (or use the fcping or fctrace CLI
commands) to verify connectivity. See the “FC Ping and FC Traceroute” section on page B-4.
Verifying SAN Element Registration
Answer the following questions to verify that your end devices are registered to the fabric:
• Are the HBAs and subsystem ports successfully registered with the fabric name server?
–
In Device Manager, choose FC > Name Server.
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In the CLI, use the show fcns commands.
• Does the correct pWWN for the HBAs and the storage subsystem ports show up on the correct port
in the FLOGI database?
–
In Fabric Manager, choose Switches > Interfaces > FC Physical > FLOGI.
–
In the CLI, use the show flogi commands.
• Are the HBA and storage subsystem on the same VSAN?
–
In Fabric Manager, choose End Devices and verify the VSAN IDs are identical.
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From the CLI, use the show vsan membership command.
• Does any single zone contain both devices?
–
In Fabric Manager, choose the Zone > Edit Full Zone Database and select the active zone set
(in bold) for the VSAN that contains the end devices. Verify that both devices are members of
the same zone.
–
From the CLI, use the show zoneset active command.
Fibre Channel End-to-End Connectivity
Answering the following questions will help to determine if end-to-end Fibre Channel connectivity
exists from a host or subsystem perspective:
• Does the host list the subsystem’s port WWN (pWWN) or FC ID in its logs?
• Does the subsystem list the host’s pWWN or FC ID in its logs or LUN masking database?
• Can the host complete a port login (PLOGI) to the storage subsystem?
• Is there any SCSI exchange that takes place between the server and the disk array?
• Is the HBA configured for N port?
You can use the HBA configuration utilities or the host system logs to determine if the subsystem pWWN
or FC ID is listed as a device. This can validate that FSPF is working correctly.
Fabric Issues
Answering the following questions will help to determine the status of the fabric configuration:
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