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.

  • The preferred primary port is disabled on both the nodes.
  • The FC-VI links in a MetroCluster configuration is up and working.
  • The unidirectional port mirroring must be enabled or disabled at both the 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.