Adaptec 412R User Guide - Page 116

DuraStor 412R/6320SS/7320SS Installation and User's Guide Operating Modes - DuraStor 7320SS Stand-Alone Mode In stand-alone mode, the RAID controller operates autonomously. The controller has two fibre channel (FC) host ports, they are labeled in the diagrams as FC1 and FC2. This operating mode uses both FC host ports. Advantages: I Low cost entry-level RAID storage solution that is field upgradeable. I Allows the use of dual host ports to maximize bandwidth and host IOPs. (For example: this configuration is ideal for sequential access patterns, where disks can supply more than 160 MB/sec of data to a host.) I The host system has multiple paths to each array (with the host driver). I All arrays appear on both host ports at the same LUN positions in Dual Port mode. (If both ports are connected to the same host, the host will see a given array twice unless it does special processing to detect duplicate paths to array. A host device driver may provide this functionality.) I Hosts can detect redundant paths to an array by matching array serial numbers from SCSI inquiry data. Disadvantages: I The controller is a single point of failure. I Third-party software is required for upstream path fail-over. A-14