Host orchestrated data copy between data storage systems with error detection and error correction

A system comprising:

• a host including processing circuitry and memory, wherein the memory has program code stored thereon;
• a source data storage system including processing circuitry and memory, wherein the memory has program code stored thereon;
• and
• a target data storage system including processing circuitry and memory, wherein the memory has program code stored thereon;
• wherein the program code, when executed, copies data from the source data storage system to the target data storage system by causing the processing circuitries to:
• perform, by the host, an optimized copy operation that reads an optimized version of the data from the source data storage system to the host and then writes the optimized version of the data from the host to the target data storage system;
• generate, in the target data storage system using the optimized version of the data, a complete unoptimized copy of the data;
• obtain, by the target data storage system from the source data storage system through an error detection communication channel that is independent from the host and that connects the source data storage system to the target data storage system, data verification information;
• and
• perform, by the target data storage system using the data verification information and the complete unoptimized copy of the data in the target data storage system, an error detection operation that identifies any chunk within the complete unoptimized copy of the data in the target data storage system that does not match the data in the source data storage system.

A computer program product including a non-transitory computer readable medium having instructions stored thereon, wherein the instructions, when executed on processing circuitry, cause the processing circuitry to copy data from a source data storage system to a target data storage system by performing steps including:

• performing, by a host, an optimized copy operation that reads an optimized version of the data from the source data storage system to the host and then writes the optimized version of the data from the host to the target data storage system;
• generating, in the target data storage system using the optimized version of the data, a complete unoptimized copy of the data;
• obtaining, by the target data storage system from the source data storage system through an error detection communication channel that is independent from the host and that connects the source data storage system to the target data storage system, data verification information;
• and
• performing, by the target data storage system using the data verification information and the complete unoptimized copy of the data in the target data storage system, an error detection operation that identifies any chunk within the complete unoptimized copy of the data in the target data storage system that does not match the data in the source data storage system.