MPIO or multi-path is a mechanism to mitigate the effects of a failure (HBA failure, switch failure, …) by routing the storage traffic over an alternate path between the servers and the storage device.
In normal situations, the system is configured redundantly to avoid unneccesary point of failure. This means:
- redundant storage (at least 2 controllers);
- redundant fabrics;
- redundant host bus adapters;