US Patent 7752340 Atomic command retry in a data storage system

A data transfer retry method includes:A. receiving a particular atomic data transfer command from a director;B. processing identification information associated with the particular atomic data transfer command;C. comparing the identification information associated with the particular atomic data transfer command to identification information of a previous atomic data transfer command received from the director;D. determining that the particular atomic data transfer command is a retry command of the previous atomic data transfer command received from the director;E. determining a status of the execution of the previous atomic data transfer command received from the director; andF. processing the particular atomic data transfer command based on the status of the execution of the previous atomic data transfer command determined in Step E.