APPARATUS, METHOD AND PROGRAM PRODUCT FOR DETERMINING THE DATA RECALL ORDER

摘要

To provide a technique for optimizing the processing order of recall requests in which the average latency time of a host apparatus is minimized. A storage manager accepts a request of the host apparatus for the recalling data from a tape library, and stores the request in a queue table. In response to storage of the request, the storage manager calculates the latency time for each request in all the conceivable execution orders for all the requests stored in the queue table. The storage manager determines the execution order which minimizes the total calculated latency time for all the requests including the active request.

主权项

1. An apparatus for use with a tape library and for determining a data recall order, the apparatus comprising:
first latency time prediction means for predicting a latency time, from an acceptance of each request for data required to be recalled from said tape library, to completion of a process in said tape library, in performing the process in each of all the execution orders conceivable for all the requests stored in a queue table; and 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.