Patent ID: 7395368

Claim:
An information processing system comprising: a library unit for retaining data; a storage unit connected to said library unit and having a storage for retaining a portion of the data of said library unit; and a data processing apparatus connected to said storage unit for gaining access to data of said storage of said storage unit, said storage unit including: a readout unit for, when processing data which is an object of processing in said data processing apparatus is not retained in said storage of said storage unit, reading said processing data from said library unit into said storage according to an access request, issued from said data processing apparatus, for access to said processing data; a first timer for, when said readout unit reads said processing data from said library unit into said storage according to said access request from said data processing apparatus, detecting the fact that an elapsed time for readout processing in said readout unit reaches a first predetermined time set in advance; and a first response unit for, when the processing in said readout unit continues after said first timer detects said first predetermined time, transmitting a signal indicative of the fact that said readout unit is normally in operation, to said data processing apparatus, and said data processing apparatus including: an implementation unit for, upon receipt of said signal indicative of the normal in-operation from said first response unit, implementing re-issue of said access request.