Patent ID: 8732393

Claim:
An apparatus for use with a tape library and for determining a data recall order, the apparatus comprising: request acceptance means for accepting a request of a host apparatus for data required to recall from said tape library; storage means for storing said request in a queue table; first latency time prediction means for predicting latency time from acceptance of each request by said request acceptance means to completion of a process in said tape library in performing the process in each of all execution orders conceivable for all the requests stored in said queue table in response to storage of said request in said queue table; first execution order determination means for determining a first execution order, as an execution order to be applied, that is an execution order in which a total sum of said latency time predicted by said first latency time prediction means for all the requests including an active request is minimum; and rearrangement means for rearranging the execution order of all said requests within said queue table in accordance with said execution order to be applied.