If the DR remove-board operation pertains to a board containing an active public network interface, Sun Cluster rejects the operation and identifies the interface that would be affected by the operation. Before removing a board with an active network interface present, all traffic on that interface must first be switched over to another functional interface in the multipathing group by using the if_mpadm(1M) command.
If the remaining network adapter fails while you are performing the DR remove operation on the disabled network adapter, availability is impacted. The remaining adapter has no place to fail over for the duration of the DR operation.
See the Sun Cluster 3.1 System Administration Guide for detailed instructions on how to perform a DR remove operation on a public network interface.