There are some unique requirements for setting up a MetroCluster configuration with array LUNs.
FlexArray Virtualization Implementation Guide for NetApp E-Series Storage
FlexArray Virtualization Implementation Guide for Third-Party Storage
You must have two sets of array LUNs—one set for the aggregate on the local storage array and another set of LUNs at the remote storage array for the mirror of the aggregate.
The array LUNs must be of the same size for mirroring the aggregate.
Single-initiator to single-target zoning limits each zone to a single FC initiator port and a single target port.