Dell PowerVault MD3820i - Manual (Page 26)

Figure 17. Dual-Port HBA Configuration (Fibre Channel)
This example shows a fully redundant fabric configuration. If a fibre channel switch or HBA fails, the
alternate switch still connects both storage controllers in the storage array. If a storage controller also
fails, the host can still access the remaining controller and all virtual disks fail over to that controller. A
complete loss of access to storage occurs if any other element fails.
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