Bandwidth efficient hash-based migration of storage volumes between storage systems

A method comprising:

• identifying a storage volume to be migrated from a source storage system to a target storage system;
• for each of a plurality of logical addresses of the storage volume, sending a command requesting a content-based signature for the logical address to at least one of the source storage system and a host device and receiving the content-based signature in response to the command;
• responsive to a first one of the received content-based signatures having a corresponding data page already stored in the target storage system, updating an associated reference count in place of requesting the corresponding data page from at least one of the source storage system and the host device;
• and
• responsive to a second one of the received content-based signatures not having a corresponding data page already stored in the target storage system, requesting the corresponding data page from at least one of the source storage system and the host device;
• wherein the command requesting a content-based signature for the logical address comprises a read hash command that includes information identifying a particular content-based signature generation algorithm associated with generation of the requested content-based signature, information identifying the storage volume and information identifying the logical address;
• wherein the target storage system receives in response to the command requesting a content-based signature for the logical address, a content-based signature of a corresponding one of the data pages, the content-based signature of the corresponding one of the data pages being generated by applying the particular content-based signature generation algorithm to content of that data page, the particular content-based signature generation algorithm comprising a particular secure hashing algorithm;
• and
• wherein the method is implemented by at least one processing device comprising a processor coupled to a memory.

A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code when executed by at least one processing device causes said at least one processing device:

• to identify a storage volume to be migrated from a source storage system to a target storage system;
• for each of a plurality of logical addresses of the storage volume, to send a command requesting a content-based signature for the logical address to at least one of the source storage system and a host device and to receive the content-based signature in response to the command;
• responsive to a first one of the received content-based signatures having a corresponding data page already stored in the target storage system, to update an associated reference count in place of requesting the corresponding data page from at least one of the source storage system and the host device;
• and
• responsive to a second one of the received content-based signatures not having a corresponding data page already stored in the target storage system, to request the corresponding data page from at least one of the source storage system and the host device;
• wherein the command requesting a content-based signature for the logical address comprises a read hash command that includes information identifying a particular content-based signature generation algorithm associated with generation of the requested content-based signature, information identifying the storage volume and information identifying the logical address, the particular content-based signature generation algorithm comprising a particular secure hashing algorithm;
• and
• wherein the target storage system receives in response to the command requesting a content-based signature for the logical address, a content-based signature of a corresponding one of the data pages, the content-based signature of the corresponding one of the data pages being generated by applying the particular content-based signature generation algorithm to content of that data page.