Patent ID: 7899971

Claim:
A mainframe storage controller, which is connected to a mainframe and another storage controller, wherein the other storage controller comprises a plurality of mainframe real volumes, and the mainframe storage controller comprises: a virtual volume associated with the respective real volumes; a converter for converting a command and data received from the mainframe to a command and data to be sent to the other storage controller, and converting data received from the other storage controller to data to be sent to the mainframe; a control information creation unit for creating control information related to the format of the virtual volume, and managing this control information by associating same with the virtual volume; and a command processor, which uses the converter and the control information creation unit to process a command issued from the mainframe, and to notify the mainframe of the result of this processing, wherein the converter comprises: a command converter, which is for converting a parameter in the command, and which, upon receiving the command for the virtual volume from the mainframe, converts a first cylinder number in this command to a second cylinder number of the corresponding real volume from among the respective real volumes; and a data converter, which is for respectively converting a count value of each record of the data received from either the mainframe or the other storage controller, and which, upon receiving the data from the mainframe, respectively converts the count value of each record in this data to the second cylinder number, and upon receiving the data from the other storage controller, respectively converts the count value of the each record in this data to the first cylinder number.