Adaptec 412R User Guide - Page 105

Theory of Controller Operation The single-port or dual-port component of the name convention refers to the number of enabled host ports on the active controller. Note that there are two host ports on each controller (internally). Table A-1 and Table A-2 summarize the operating modes for the DuraStor 6320SS and 7320SS, respectively. Table A-1 Summary of Operating Modes - DuraStor 6320SS Operating Mode Stand-Alone Single-Port Stand-Alone Dual-Port Active-Active Single-Port Active-Passive Dual-Port Number of Controllers 1 1 2 2 Number of Active Host Ports per Controller 1 Number of Disk Channels 3 2 2 1 2 2 (active 2 controllers only) Table A-2 Summary of Operating Modes - DuraStor 7320SS Operating Mode Stand-Alone Dual-Port Active-Active Single-Port Active-Active Dual-Port Active-Passive Dual-Port Number of Controllers 1 2 2 2 Number of Active Host Ports per Controller 2 Number of Disk Channels 4 1 4 2 4 2 (active 4 controllers only) (DuraStor 7320SS Only) Another consideration when selecting one of these topologies is whether you will enable or disable the internal hubs. Each DuraStor storage subsystem has built-in internal hubs. These internal hubs, when enabled, essentially replace the need for external hub hardware. They provide for up to A-3