How fabric-attached MetroCluster configurations use Brocade and Cisco Fibre Channel switches
A MetroCluster configuration for distances greater than 500 meters connects the two nodes by using four Brocade or Cisco Fibre Channel switches in a dual-fabric configuration for redundancy.
Each site has two Fibre Channel switches, each of which is connected through an Inter-Switch Link to a partner switch at the other site. The Inter-Switch Links are fiber optic connections that provide a greater distance between nodes than other HA pairs . For more information about the switches, see the Fabric-attached MetroCluster Systems Brocade Switch Configuration Guide for Brocade switches and Fabric-attached MetroCluster Systems Cisco Switch Configuration Guide for Cisco switches, available at the NetApp Support Site.
Each local switch combines with a partner switch to form a fabric. By using four switches instead of two, redundancy is provided to avoid single-points-of-failure in the switches and their connections.
Like a stretch MetroCluster configuration, a fabric-attached MetroCluster configuration employs SyncMirror to build a system that can continue to serve data even after complete loss of one of the nodes and the storage at that site. Data consistency is retained, even when the data is contained in more than one aggregate.
Starting with Data ONTAP 8.2.1, the fabric-attached MetroCluster configuration supports ISL encryption on Brocade 65 10 switches. To learn more about enabling ISL encryption on your Brocade switch, see the Fabric-attached MetroCluster Systems Brocade Switch Configuration Guide.