I am modifying all my default ethernet mtu to jumbo mtu 9216 using the below command.
policy-map type network-qos N5K-JUMBO class type network-qos class-fcoe pause no-drop mtu 2158 class type network-qos class-default mtu 9216 multicast-optimize system qos service-policy type network-qos N5K-JUMBO
Now, i have to set my N5k for fcoe traffic. as per the cisco document, it says i need to reapply the default system service profile for fcoe to work.
In my case, my fcoe is already enabled in my N5k and i added on policy map above for my jubm mtu for all n5k ethernet interfaces.
But, as per cisco doc it says, i have to reapply again the qos service policies if i modified the default policies on the system qos.