US Patent 10884651 Storage system with multi-phase verification of synchronously replicated data

A storage system in one embodiment is configured to participate as a source storage system in a synchronous replication process with a target storage system. In verifying synchronously replicated data, the source storage system generates a current snapshot for one or more storage volumes subject to synchronous replication to the target storage system, identifies a plurality of pages of the current snapshot that have changed since generation of a previous snapshot for the one or more storage volumes, obtains content-based signatures for respective ones of the changed pages, assigns the changed pages to a page group, generates a group signature for the page group based at least in part on the content-based signatures of the pages of the page group, and sends the group signature to the target storage system. The group signature is configured to allow the target storage system to determine if the page group contains at least one page that is inconsistent between the source and target storage systems.