Optimizing deduplication hit-rate in a remote copy environment

A system for managing a storage system, the storage system comprising a primary system and a backup system, wherein the backup system is in a copy relationship with the primary system, the system comprising:

• responsive to a write I/O operation, the write I/O operation comprising first data:
• at the primary system:
• a first cryptographic component for calculating a first cryptographic value for the first data;
• a lookup component for scanning a first directory to identify an entry corresponding to the first cryptographic value to determine a first set of addresses associated with the write I/O operation;
• a first send/receive component for transmitting the first set of addresses to the backup system;
• and
• a first lookup management component for updating the first directory with a first entry for the write I/O operation, the first entry comprising a pointer to the first set of addresses;
• at the backup system:
• a second lookup management component for updating a second directory with a second entry for the write I/O operation, the second entry comprising a pointer to a second set of addresses corresponding to the first set of addresses.

A computer program product for managing a storage system, the storage system comprising a primary system and a backup system, wherein the backup system is in a copy relationship with the primary system, the computer program product comprising:

• a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
• in response to a write I/O operation, the write I/O operation comprising first data:
• at the primary system:
• calculating a first cryptographic value for the first data;
• scanning a first directory to identify an entry corresponding to the first cryptographic value to determine a first set of addresses associated with the write I/O operation;
• transmitting the first set of addresses to the backup system;
• and
• updating the first directory with a first entry for the write I/O operation, the first entry comprising a pointer to the first set of addresses;
• at the backup system:
• updating a second directory with a second entry for the write I/O operation, the second entry comprising a pointer to a second set of addresses corresponding to the first set of addresses.