Adaptec 1966600 User Guide - Page 68

DuraStor 6220SS/7220SS Installation and User's Guide These modes address everything from direct attach single controller configuration to high-availability dual controller SAN configurations. The DuraStor 7220SS storage subsystem features built-in internal hubs that add further flexibility to the different operating modes, thus reducing the reliance on external hubs and cables. The topologies are described for each operating mode based on whether the internal hub is disabled or enabled. The following sections provide a description of each topology operating mode: s Stand-Alone Dual-Port Topology on page 3-34 s Active-Active Dual-Port Topology on page 3-34 s Active-Active Single-Port Topology on page 3-35 Stand-Alone Dual-Port Topology Use stand-alone dual-port mode when you have an application that requires a low cost high-performance fault-tolerant disk storage solution. This solution provides a single controller configuration that supports multiple or dual-ported hosts. Use stand-alone dual-port mode with the internal hubs disabled when the application requires an external switch/hub. See StandAlone Dual-Port (Hubs Disabled) on page 3-38. Stand-alone dual-port mode with the internal hubs enabled is ideal in clustered applications where multiple hosts must have access to the same storage. No external switches or hubs are required. See Stand-Alone Dual-Port, Hubs Enabled on page 3-39. Active-Active Dual-Port Topology Use active-active dual-port mode when you have an application that requires a high-performance, robust, full system-level faulttolerant disk storage solution. This dual controller configuration supports multiple hosts and has true failover and failback operations. All host input ports are active and available to external hosts. Use active-active dual-port mode with the internal hubs disabled when the application requires an external switch/hub. This mode is generally used when four or more hosts are required. Single loop 3-34