Cisco MDS 9000 Series

Database Merge Guidelines
For information about CFS merge support, refer to the Cisco MDS 9000 Family NX-OS System Management
Configuration Guide for detailed concepts.
When merging two device alias databases, follow these guidelines:
• Verify that two device aliases with different names are not mapped to the same pWWN.
• Verify that two different pWWNs are not mapped to the same device aliases.
• Verify that the combined number of device aliases in both databases cannot exceed 8191 (8K) in fabrics
running SAN-OS Release 3.0(x) and earlier, and 20K in fabrics running SAN-OS Release 3.1(x) and
later. If the combined number of device entries exceeds the supported limit, then the merge will fail.
• Ensure the device -alias mode is similar for the both the fabrics being merged.
Device Alias Configuration Verification
You can view device alias information by using the show device-alias command. See the following examples.
Displays All Configured Device Aliases from the Effective Database
switch# show
device-alias database
device-alias name SampleName pwwn 21:00:00:e0:8b:0b:66:56
device-alias name x pwwn 21:01:00:e0:8b:2e:80:93
Total number of entries = 2
Displays the Pending Database with No Modifications
switch# show
device-alias database pending
There are no pending changes
Displays the Pending Database with Modifications
switch# show
device-alias database pending
device-alias name x pwwn 21:01:00:e0:8b:2e:80:93
device-alias name SampleName pwwn 21:00:00:e0:8b:0b:66:56
device-alias name y pwwn 21:00:00:20:37:39:ab:5f
device-alias name z pwwn 21:00:00:20:37:39:ac:0d
Total number of entries = 4
Displays the Specified Device Name in the Pending Database
switch# show
device-alias name x pending
device-alias name x pwwn 21:01:00:e0:8b:2e:80:93
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
169
Distributing Device Alias Services
Database Merge Guidelines