Cisco 9134 - MDS Multilayer Fabric Switch Troubleshooting Manual page 312

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
Because the application is busy, it cannot validate the device alias database, and it returns a busy
response to the device alias process. This information is propagated back to CFS. CFS then waits for the
length of the defined retry time, and then automatically retries the device alias merge. During the defined
retry time, the device alias merge status is shown as in progress. (See
Example 15-8 Displaying Merge Status
switch-1# show cfs merge status na device-alias
Physical-fc
If the application lock is released within the defined CFS retry time, the device alias validation can be
processed. Otherwise, the application returns a busy response to the process again, and CFS again waits
for the length of the defined retry time before retrying the device alias validation again. This situation is
repeated until the application lock is released.
This is not an uncommon situation. When the ISL comes up between two fabrics, it typically triggers a
CFS merge of multiple applications. By the time the device alias merge moves to validation stage, other
applications may be busy handling their own merge. This is a transient state, and the device alias merge
would be backed off and retired after the defined retry time.
If, for any reason, the application database remains locked, the device alias merge remains in progress
and cannot complete.
To verify a locked application database and to determine how to proceed, follow these steps:
Use the show cfs merge status na device-alias command to see the merge status.
Step 1
switch-1# show cfs merge status na device-alias
Physical-fc
Local Fabric
--------------------------------------------------------------------------
Switch WWN
--------------------------------------------------------------------------
20:00:00:0d:ec:2f:c1:40 172.20.150.38
Total number of switches = 1
Remote Fabric
---------------------------------------------------------------------------
Switch WWN
---------------------------------------------------------------------------
20:00:00:0d:ec:04:99:40 172.20.150.30
Total number of switches = 1
Obtain more information about the progress of the merge by using the show device-alias internal
Step 2
validation-info command. In the following example, SAP 110 (IVR) on SWWN
20:00:00:0d:ec:04:99:40 (switch-2) has rejected the validation. The explanation indicates that the IVR
application has rejected the validation because it is busy.
switch-1# show device-alias internal validation-info
Validation timer:
Per SAP Info Table:
===================
SAPS:
MTS Buffer Array Details:
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
15-10
Merge Status: In Progress
Merge Status: In Progress
IP Address
switch-1
IP Address
0s
0
Chapter 15 Troubleshooting Distributed Device Alias Services
Example
===> Status shows merge is still in progress
===>The merge status shows in progress
[Merge Master]
[Merge Master]
15-8).
OL-9285-05