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Dell Storage Manager 2020 R1 Administrator's Guide

Legacy Mode

Legacy mode provides controller redundancy for a dual-controller Storage Center by connecting multiple primary and reserved ports to each Fibre Channel or Ethernet switch.

NOTE:Legacy mode is not available on SCv2000 or SCv3000 series storage systems.

In Legacy mode, each primary port on a controller is paired with a corresponding reserved port on the other controller. During normal conditions, the primary ports process I/O and the reserved ports are in standby mode. If a controller fails, the primary ports fail over to the corresponding reserved ports on the other controller. This approach ensures that servers connected to the switch do not lose connectivity if one of the controllers fails. For optimal performance, the primary ports should be evenly distributed across both controllers. When possible, front-end connections should be made to separate controller I/O cards to improve redundancy.


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