This document discusses stretch clusters and how they can provide zero downtime and zero touch failover between geographically separated sites. It describes how stretch clusters use synchronous mirroring between sites to create a single shared storage volume accessible from both locations. If one site goes down, virtual machines can automatically failover and resume at the other site without interruption. When the failed site returns, resynchronization occurs in the background. The document provides examples of how healthcare organizations and others can benefit from stretch clusters for high availability across multiple facilities.