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9-2
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 9 Troubleshooting N-Port Virtualization
Initial Troubleshooting Checklist
Initial Troubleshooting Checklist
Troubleshooting an NPV problem involves gathering information about the switch configuration and
connectivity of individual devices and the entire SAN fabric. Begin your troubleshooting activity as
follows:
Limitations and Restrictions
• NPV core switches must support NPIV.
• You cannot manually assign the server interfaces to a specific NPV core switch link. If an NPIV
capable module is connected to the server interface, all the logins from the NPIV capable module
will use the same NPIV core switch link.
• Remote SPAN is not supported.
• A maximum of 16 VSANs are supported on an NPV device.
• Local switching is not supported; rather, all traffic is switched via the NPV core switch.
• Only F, NP, and SD ports are supported in NPV mode.
• CFS and QoS are not supported.
• IVR, SDV and FICON are not supported.
• If an NPV link failover occurs, servers that are booted over the SAN with NPV will temporarily lose
access to their boot LUNs.
Common CLI Commands for NPV
Note Because the output is based on name server database information, the show fcns database npv
commands can be run from any MDS switch running SAN-OS 3.2(1) or later. The switch does not need
to be NPV enabled.
Checklist Check off
Verify that the NPV core switch supports NPIV and that NPIV is enabled.
Verify that NPV is enabled on the NPV device.
Verify that the ports are properly connected.
For all NPV core switch links, ensure that the port mode on the NPV device is NP Port,
and ensure that the port mode on the NPV core switch is F Port.
Ensure that the VSAN values configured on both sides of NPV core switch link are the
same.
For all the device links, ensure that the port mode on the NPV device is F port.
Ensure that the VSAN value configured on the device links is correct.
Verify the status of servers and external interfaces, using the show npv status command.
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