Adaptec 412R User Guide - Page 118

DuraStor 412R/6320SS/7320SS Installation and User's Guide Active-Active Mode In the active-active mode, the two RAID controllers cooperate to provide redundancy. If one controller fails, the remaining controller will take over the failed controller's functionality. Each controller has two fibre channel host ports, they are labeled in the diagrams as FC1 and FC2. In the active-active single-port mode, one FC host port is normally active, and the other is normally passive. In a failed over condition, the passive port of the surviving controller becomes active and assumes the identity of the failed controller. This failover process occurs without user intervention. Table A-5 lists the presentation of LUNs in active-active single-port mode. In the active-active dual port mode, both FC host ports are active and each controller normally presents the LUNs it owns on both of its FC host ports. This provides the host with dual-ported access. However, when a controller fails, the surviving controller presents its LUNs on one of its FC host ports and the LUNs of the failed controller on its other FC host port. Table A-6 lists the presentation of LUNs in active-active dual port mode. Table A-5 Presentation of LUNs in Active-Active Single-Port Mode Controller Status Both controllers online Controller 1 fails Controller 2 fails Controller 1 Controller 1 Controller 2 Controller 2 FC 1 Host Port FC 2 Host Port FC 1 Host Port FC 2 Host Port Controller 1 Passive LUNs Controller 2 Passive LUNs Inactive Controller 1 LUNs Inactive Controller 2 LUNs Controller 2 LUNs Inactive Controller 1 LUNs Inactive A-16