Rackable Systems OmniStor 4900F Series, User Manual

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Chapter 2 - Topologies and Operating Modes
Multi-Port Mirrored Single Host-Dual Connection
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Example of Multi-Port Mirrored in Fail-Over Mode
The following illustration demonstrates how the ports failover in the Multi-Port Mirrored
topology.
Switch 6 which enables automatic internal hub failover when a controller failure is detected
and also controls the logical function of switch 4. When a controller failure is detected, the
logic circuit will close connecting the “H0” and “H1” ports on the Host I/O card,
regardless of the physical position of switch 4.
As shown below even though switch 4 is disabled (down position) when the controller
failed, switch 6 logically enabled that circuit providing alternate paths to the surviving
controller ports.
Duplex Mode Logical View - Multi-Port Mirrored Single Host-Dual Connection (Failover)