Adaptec 412R User Guide - Page 114
Advantages:, Upstream fail-over.
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DuraStor 412R/6320SS/7320SS Installation and User's Guide Each controller sends heartbeat messages via the SCSI buses to its partner controller. If a controller does not receive a heartbeat message within a set time period, it will kill the other controller assuming that it has malfunctioned. After killing the other controller, it will take ownership of the arrays and will activate its passive host port to assume the defunct controller's identity. Warning: The controllers communicate with each other using SCSI Initiator IDs 6 and 7 on each of the disk channels. You should not change these ID settings. Advantages: I Transparent fail-over and fail-back. I Single point of failure is the host system. (There are no single points of failure when dual host systems are configured with clustering software.) I Upstream fail-over. Disadvantages: I Lower performance than the active-active mode. I Upstream fail-over requires third-party software. I Careful administration is necessary because all the arrays are reported twice to the host operating system, which must use third-party file share/file lock software to prevent data overwrites. A-12