US Patent 11231867 Data replication using deduplication and synchronized hash tables

Techniques for processing write operations may include: receiving, at a first data storage system, a first write operation that writes first data to a first device, wherein the first device is configured for replication on a second device of a second data storage system; performing first processing that determines whether the first data written by the first write operation is a duplicate of an existing entry in a first hash table of the first data storage system; responsive to determining the first data written by the first write operation is a duplicate of an existing entry in the first hash table, performing second processing; responsive to determining the first data written by the first write operation is unique and is not a duplicate of an existing entry in the first hash table, performing third processing; and transmitting the final buffer to the second data storage system.