Enabling unidirectional port mirroring in a MetroCluster configuration

The unidirectional port mirroring allows you to use the FC-VI link effectively and therefore increases the performance throughput. By enabling the unidirectional port mirroring, one link in an FC-VI interconnect will be used for outgoing data traffic and the other for incoming traffic between the two nodes in a MetroCluster configuration.

1. Verify the status of the FC-VI links by entering the following command:sysconfig -v
2. For enabling or disabling unidirectional port mirroring, do one of the following:

   If you want to...	Then enter the following command...
   Enable the unidirectional port mirroring.	ic unidirectional_mirroring on Note: This is a default behavior. Therefore, you must first check the status of unidirectional port mirroring before enabling this feature.
   Disable the unidirectional port mirroring.	ic unidirectional_mirroring off

   Note: When reverting to a Data ONTAP release prior to Data ONTAP 8.2.1, the unidirectional port mirroring gets disabled automatically.
3. Verify the status of the unidirectional port mirroring by entering the following command:ic unidirectional_mirroring statusIf the unidirectional port mirroring is enabled, it displays the following output:

   Unidirectional mirroring is enabled
   For outgoing data primary link is 0 and current link in use is 0.
   For incoming data primary link is 1 and current link in use is 1.
   

   If the unidirectional port mirroring is disabled, it displays the following output:

   Unidirectional mirroring is disabled
   For outgoing data primary link is 0 and current link in use is 0.
   For incoming data primary link is 0 and current link in use is 0.

   Note: When the unidirectional port mirroring is disabled, the primary link and current link in use for both outgoing and incoming traffic will be the same.