Patent ID: 7594076
Filing Date: 2009-09-22
Classification: G06F

Abstract:
1. A disk array apparatus having a source volume that is a source for data migration, and the disk array apparatus migrating the data to a destination volume that is a destination for the data migration, the disk array apparatus comprising: an access frequency calculator for calculating a separate access frequency of access to the source volume for each of a plurality of time periods, respectively, extending backwards in time from a data migration termination date and time when the data migration termination date and time is designated externally, each time period of the plurality of time periods being of a predetermined length of time; an estimated data migration amount calculator for calculating a separate estimated data migration amount for each respective time period of the plurality of time periods, based on the separate access frequency calculated for the respective time period by the access frequency calculator; and a data migration start date and time calculator for calculating a data migration start date and time based on a collection of estimated data migration amounts for the plurality of time periods, as calculated by the estimated data migration amount calculator.