What does Storage Failover Allow?

Storage Failover allows disk aggregates and storage to fail over between HA partner nodes. When one node becomes unavailable, its HA partner automatically assumes ownership of its disks and aggregates, ensuring continuous data availability. This is the core function of the HA pair architecture in Data ONTAP.

A plex is a RAID-level concept representing a mirrored copy within an aggregate; disks do not fail over to a plex, which is not a node or controller entity.

Storage Failover is scoped specifically to HA partner pairs and does not allow disks to fail over to any arbitrary node in a cluster; cluster-wide disk mobility is a different and more limited concept.

The Epsilon node is a special designation used for quorum tiebreaking in a cluster and does not serve as a failover target for disk or aggregate resources.