To maintain a constant connection between an ESXi host and its storage, ESXi supports multipathing. Multipathing is a technique that lets you use more than one physical path for transferring data between the ESXi host and the external storage device.

In case of a failure of an element in the SAN network, such as an HBA, switch, or cable, ESXi can fail over to another physical path. In addition to path failover, multipathing offers load balancing, which redistributes I/O loads between multiple paths, thus reducing or removing potential bottlenecks.