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This Technical White Paper describes the procedure of re-configuring Linux multipathing for optimized load balancing using the so-called group-by-prio mode. Even though the group-by-prio mode may be considered merely a special case of the failover mode, the assignment of active paths (that is, primary paths) and paths in enabled state (that is, secondary or backup paths) can only be controlled when using the group-by-prio configuration setting. In the case of Linux multipathing, failover means that in the event of a failure of the currently active path, I/O traffic is automatically routed over the next available secondary path.
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