Efficient token management in a storage system

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 the at least one processing device:

• to receive a create-token command from a host device, the create-token command specifying one or more logical address ranges of one or more source storage volumes of a storage system;
• responsive to receipt of the create-token command, to create the token, to generate an in-memory snapshot of data in the one or more logical address ranges of the one or more source storage volumes, to associate the in-memory snapshot with the token, and to provide the token to the host device;
• to receive a write-via token command from the host device, the write-via-token command specifying the token and one or more logical address ranges of one or more target storage volumes;
• and
• responsive to receipt of the write-via-token command, to determine whether or not differential metadata of the storage system includes one or more entries for the one or more logical address ranges of the one or more source storage volumes, and to control execution of the write-via-token command based at least in part on the determinations
• wherein the differential metadata of the storage system comprises at least one metadata delta log comprising one or more delta log buffers each comprising one or more delta log records.

A method comprising:

• receiving a create-token command from a host device, the create-token command specifying one or more logical address ranges of one or more source storage volumes of a storage system;
• responsive to receipt of the create-token command, creating the token, generating an in-memory snapshot of data in the one or more logical address ranges of the one or more source storage volumes, associating the in-memory snapshot with the token, and providing the token to the host device;
• receiving a write-via token command from the host device, the write-via-token command specifying the token and one or more logical address ranges of one or more target storage volumes;
• and
• responsive to receipt of the write-via-token command, determining whether or not differential metadata of the storage system includes one or more entries for the one or more logical address ranges of the one or more source storage volumes, and controlling execution of the write-via-token command based at least in part on the determination;
• wherein the differential metadata of the storage system comprises at least one metadata delta log comprising one or more delta log buffers each comprising one or more delta log records;
• and
• wherein the method is performed by at least one processing device comprising a processor coupled to a memory.