To prevent data corruption during a LUN snapshot restore, administrators must first safely halt operations by quiescing host I/O. Next, the host is disconnected from the production LUN, and any hosts currently attached to the LUN's snapshots must be detached to remove active dependencies. Once these safety prerequisites are met, the administrator selects the restore operation. Before overwriting the active LUN, the storage system automatically generates a backup snapshot of the current LUN state as a fail-safe mechanism against accidental data loss. Finally, the system executes the operation, and the LUN is fully restored to the data state captured in the chosen snapshot.

Dell Technologies. (2021). Dell EMC Unity: Snapshots and Thin Clones - A Detailed Review. Dell EMC Engineering White Paper (Document ID: H15089). Section: "Snapshot Restore Operations," pp. 18-20. This document explicitly outlines the prerequisite sequence of quiescing I/O, disconnecting hosts, and detaching snapshots before initiating a restore, as well as the system's automatic fail-safe snapshot creation.

Dell Technologies Support. Dell Unity Family Data Protection Guide. Chapter: "Managing Snapshots," Section: "Restore a block storage resource from a snapshot." This vendor documentation details the step-by-step UI and system workflow for LUN restoration corresponding exactly to the sequence provided.