Simple definition
Storage multipathing configures multiple access paths to a volume for resilience and, depending on policy, I/O distribution.
Purpose and use
Multipathing uses several paths between a host and the same storage to retain access and, under selected policies, distribute I/O.
How does it work?
A management layer identifies paths to one device and selects which to use or avoid.
Example and verification
Test planned path loss and verify continued volume access without duplicate device presentation.
Points to watch
Several paths do not guarantee independent controllers or fabrics and do not always multiply throughput.
In short
Verify redundancy end to end rather than inferring it from a displayed path count.