Abstract: A disk control device includes a hypervisor, a cache access measurement unit, and a distribution determination unit. The cache access measurement unit measures a characteristic value of a logical disk by analyzing an access pattern to the logical disk by a cache memory. The distribution determination unit selects one of a plurality of virtual computers including the cache memory associated with the measured characteristic value. The hypervisor activates the virtual computer selected by the distribution determination unit and switches a forwarding destination of an input-output request to the logical disk to the virtual computer selected by the distribution determination unit.

Abstract: A disk control device includes a hypervisor, a cache access measurement unit, and a distribution determination unit. The cache access measurement unit measures a characteristic value of a logical disk by analyzing an access pattern to the logical disk by a cache memory. The distribution determination unit selects one of a plurality of virtual computers including the cache memory associated with the measured characteristic value. The hypervisor activates the virtual computer selected by the distribution determination unit and switches a forwarding destination of an input-output request to the logical disk to the virtual computer selected by the distribution determination unit.

Abstract: A storage control device capable of avoiding a decrease in performance related to accesses to a storage device from a start time of a certain time zone is provided. A schedule information storing unit 130 stores schedule information indicating target data in an access to a storage device in a predetermined time zone. The target data is a target of a cache control using a cache memory. A cache processing unit 120 performs the cache control for the access to the target data and an access to data other than the target data in a time zone except the predetermined time zone, and performs the cache control for the access to the target data in the predetermined time zone. A preprocessing unit 140 performs a preprocessing to make the cache memory available for the cache control of the target data by a start time of the predetermined time zone.

Abstract: To prevent an increase in the management information and to increase the capacity of a secondary cache. The cache control device includes: a secondary cache having the data of the data sector and management information; and a primary cache having a digest value calculated from the address of the data and secondary management information. A controller includes: a digest value calculation unit which calculates the digest value of the data when reading out the data; a management information searching unit which searches the management information in the primary cache based on the digest value; and a readout control unit which specifies the data sector in the secondary cache based on the management information and reads out the data.

Abstract: A more space-saving capacity is realized by: preventing performance deterioration when a controller failure occurs; and reserving and releasing an usage area of the storage medium used on that occasion by internally measuring an operation load and a processing capability possessed by the apparatus and calculating a capacity required for maintaining a write cache periodically. In a disk array apparatus, the controller comprising: a host control unit to control reception of data from a host; a memory control unit to control a first memory and a second memory, the second memory for duplicating data with the first memory at a time of a controller failure, to set a free space of the second memory by making a free space of the first memory be increased and decreased in a predetermined time interval; and an HDD control unit to control sending and receiving of data to and from the disk array.

Abstract: A storage control device capable of avoiding a decrease in performance related to accesses to a storage device from a start time of a certain time zone is provided. A schedule information storing unit 130 stores schedule information indicating target data in an access to a storage device in a predetermined time zone. The target data is a target of a cache control using a cache memory. A cache processing unit 120 performs the cache control for the access to the target data and an access to data other than the target data in a time zone except the predetermined time zone, and performs the cache control for the access to the target data in the predetermined time zone. A preprocessing unit 140 performs a preprocessing to make the cache memory available for the cache control of the target data by a start time of the predetermined time zone.

Abstract: To prevent an increase in the management information and to increase the capacity of a secondary cache. The cache control device includes: a secondary cache having the data of the data sector and management information; and a primary cache having a digest value calculated from the address of the data and secondary management information. A controller includes: a digest value calculation unit which calculates the digest value of the data when reading out the data; a management information searching unit which searches the management information in the primary cache based on the digest value; and a readout control unit which specifies the data sector in the secondary cache based on the management information and reads out the data.