Query: When is it necessary to use a host multipathing driver for load balancing?
Source: sg247938.pdf
Relevant passages:
For load balancing and access redundancy on the host side, the use of a host multipathing driver is required in the following situations: Protection from fabric link failures, including port failures on the IBM Spectrum Virtualize system nodes Protection from a host HBA failure (if two HBAs are in use) Protection from fabric failures if the host is connected through two HBAs to two separate fabrics  Provide load balancing across the host HBA