Adaptec 412R User Guide - Page 132

DuraStor 412R/6320SS/7320SS Installation and User's Guide Active-Active Dual-Port Mode for SAN At the heart of this strategy is the active-active dual-port operating mode. In this mode, four fibre channel (FC) ports are simultaneously active when both controllers are online. In the event of a controller failure, two FC ports remain available to service all host I/O. Table B-1 illustrates how LUNs are presented by each controller in this mode. Table B-1 LUN Presentation by Controller Both Controllers Online Controller 1 Failed Controller 2 Failed Controller 1 Host Port 0 (FC1) Controller 1 LUNs Controller 1 Host Port 1 (FC2) Controller 1 LUNs Inactive Inactive Controller 1 LUNs Controller 2 LUNs Controller 2 Host Port 0 (FC1) Controller 2 LUNs Controller 2 LUNs Inactive Controller 2 Host Port 1 (FC2) Controller 2 LUNs Controller 1 LUNs Inactive Note that when a controller fails, the surviving controller continues to present its LUNs to its Host Port 0, and changes to present the failed controller's LUNs to its Host Port 1. The fibre channel node and port world wide names corresponding to the failed controller's Host Port 0 (FC1) are also associated with its LUNs on the surviving controller's Host Port 1 (FC2). B-2