Which important feature on the front end is provided to the clients by multiple servers that access the same storage devices across the SAN?

Recovery is a reactive process of restoring data or services after a failure has already occurred, not the proactive front-end availability feature that multiple servers inherently provide to clients.

Redundancy is the direct result of deploying multiple servers that all access the same back-end SAN storage and serve the same data to front-end clients - if one server fails, another continues serving requests without interruption. This multi-path server architecture removes the server as a single point of failure, which is the core front-end feature clients receive from this design. Redundancy is a foundational SAN high-availability principle, often combined with multipathing at the storage layer.

Resiliency describes the broad ability of a system to withstand and recover from disruptions, whereas redundancy is the specific architectural feature that multiple servers sharing SAN storage directly deliver to front-end clients.

Security relates to access control, authentication, and data protection, which are not the distinguishing features that multiple servers sharing common SAN storage provide to clients at the front end.

Storage is the resource being accessed rather than a feature delivered to clients; the value to clients from this architecture is uninterrupted access enabled by redundant server paths, not the storage itself.