Cisco MDS-9124 Troubleshooting Guide - Page 308
Resolving Mapping a pWWN to Different Device Alias Names, Resolving Mode Mismatch
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Merge Failure Issues Chapter 15 Troubleshooting Distributed Device Alias Services Send documentation comments to [email protected] 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: Step 1 Step 2 Step 3 Step 4 Review the CFS or device alias merge failure syslogs to confirm that the merge failed. Optionally, you 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. switch-1# show device-alias merge status Result: Failure Reason: Another device-alias already present with the same pwwn. Identify the pWWN that is mapped to two different device alias names by using the show device-alias 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 device-alias name A3 pwwn 21:01:01:01:01:01:01:02 Total number of entries = 1 switch-2# show device-alias database device-alias name A1 pwwn 21:01:01:01:01:01:01:02 Total number of entries = 1 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: Step 1 Step 2 Review the CFS or device alias merge failure syslogs to confirm that the merge failed, or issue the show 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 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 Result: Failure Reason: Databases could not be merged due to mode mismatch. Note All switches in the fabric must be running SAN-OS Release 3.1(1) or later to support device alias enhanced mode operation. 15-6 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x OL-9285-05