Patent ID: 8589644

Claim:
A computer-readable, non-transitory medium storing an access control program causing a computer to perform: accessing a storage device with a storage area indicated by second address information as an access destination, when a device driver receives an access request to the storage device from a higher-level layer, by referring to a storage module that stores therein a correspondence relationship between a first address specified by kernel and a second address converted from the first address that are address information indicative of a storage area in the storage device and by converting the first address information included in the access request to the second address information; counting number of access requests to each storage area from the higher-level layer to the device driver in a given period of time for each piece of the first address information; updating the correspondence relationship in the storage module such that the second address information is lined up in a descending order of the first address information of a higher number of the access requests counted; calculating standard deviation of a rate of an area where a load caused by access requests is equal to or more than a certain level in a given period of time for each dividing unit by dividing a storage area in the storage device by a plurality of dividing units and by calculating the rate of the area where the load is equal to or more than the certain level in a given time zone for each of the dividing units in the given period of time; deciding a smallest dividing unit out of the dividing units that are determined to have the standard deviation of equal to or less than a given threshold value as a range of area for the first address information and the second address information of the correspondence relationship stored in the storage module by determining whether each standard deviation calculated is equal to or less than the given threshold value; and changing storage areas of data stored in the storage device based on the correspondence relationship updated.