Advantages of multipath HA

Multipath connections in an HA pair reduce single-points-of-failure.

By providing two paths from each controller to every disk shelf, multipath HA provides the following advantages:

  • The loss of a disk shelf module, connection, or host bus adapter (HBA) does not require a failover.

    The same storage system can continue to access the data using the redundant path.

  • The loss of a single disk shelf module, connection, or HBA does not prevent a successful failover.

    The takeover node can access its partner’s disks using the redundant path.

  • You can replace modules without having to initiate a failover.
Note: While multipath HA adds value to a stretch MetroCluster environment, it is not necessary in a fabric MetroCluster configuration since multiple paths already exist.