1. A method for executing data transfer commands to perform data transfer operations between a first processing unit and second processing unit, wherein the second processing unit controls access to a storage system, wherein the storage system storage space is logically divided into multiple tracks, wherein each track includes one or more data records, wherein each data record includes an index area providing index information on content of the data record and a user data area including user data, comprising the first processing unit transmitting, for each track in the range of tracks, a data transfer command to the second processing unit to perform a data transfer operation between the first and second processing units, wherein the data transfer command causes the second processing unit to perform data transfer operations with respect to user data areas in multiple data records on an accessed track in the range of tracks, and wherein the data transferred during the data transfer operation is free of data from the index areas of the data records.