Resolving Mapping A Pwwn To Different Device Alias Names; Resolving Mode Mismatch - Cisco 9134 - MDS Multilayer Fabric Switch Troubleshooting Manual

Merge Failure Issues
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

Resolving Mapping a pWWN to Different Device Alias Names

To verify that the same pWWN is mapped to different device alias names in the fabrics, follow these
steps:
Review the CFS or device alias merge failure syslogs to confirm that the merge failed. Optionally, you
Step 1
can issue the show cfs merge status name device-alias command to view the status of the merge.
Verify the reason for the merge failure by using the show device-alias merge status command.
Step 2
switch-1# show device-alias merge status
Identify the pWWN that is mapped to two different device alias names by using the show device-alias
Step 3
database command from the appropriate switch in each of the fabrics. In this example, the pWWN
21:01:01:01:01:01:01:02 is mapped to device alias A3 on switch switch-1, and to device alias A1 on
switch switch-2.
switch-1# show device-alias database
switch-2# show device-alias database
Step 4 Make the appropriate changes to the device alias database for one of the fabrics. Refer to the Cisco MDS
9000 Family CLI Configuration Guide for details.

Resolving Mode Mismatch

The device alias feature can operate in either basic or enhanced mode. If the modes are different in the
two fabrics, the CFS merge between those fabrics will fail.
To verify that the device alias mode is different in the two fabrics, follow these steps:
Review the CFS or device alias merge failure syslogs to confirm that the merge failed, or issue the show
Step 1
cfs merge status name device-alias command to view the status of the merge.
Verify that the reason for the merge failure is a mode mismatch by using the show device-alias merge
Step 2
status command. The reason is either "Databases could not be merged due to mode mismatch" or "One
of the merging fabrics cannot support device-alias enhanced mode."
switch-1# show device-alias merge status
Note
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
15-6
Result: Failure
Reason: Another device-alias already present with the same pwwn.
device-alias name A3 pwwn 21:01:01:01:01:01:01:02
Total number of entries = 1
device-alias name A1 pwwn 21:01:01:01:01:01:01:02
Total number of entries = 1
Result: Failure
Reason: Databases could not be merged due to mode mismatch.
All switches in the fabric must be running SAN-OS Release 3.1(1) or later to support device alias
enhanced mode operation.
Chapter 15 Troubleshooting Distributed Device Alias Services
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