Abstract: A control device is configured to receive a first write request of first data, calculate a first parity of the first data, store the first data and the first parity into a storage region so that the first data is stored redundantly, identify a certain area which has a possibility that a write process to the certain area is requested after a read process from the certain area is requested, receive a read request of the first data stored in the certain area, read the first data and the first parity, and store the first data and the first parity into a memory, receive a second write request of a second data, calculate a second parity based on the second data, the first data stored in the memory and the first parity stored in the memory, and store the second data and the second parity into the storage region.

Abstract: A storage control system includes one or more memories, and one or more processors configured to acquire first processing performance of a storage device at a first time and second processing performance of the storage device at a second time before the first time, perform determination of multiplicity of logical formatting for the storage device based on a difference between the first processing performance and the second processing performance, and perform, based on the determined multiplicity, issuance of one or more logical formatting commands to the storage device.

Abstract: A storage control device configured to control a storage device including a plurality of groups each of which includes a plurality of storage regions, the storage control device includes a memory and a processor coupled to the memory and configured to store, into the memory, information associated with each of the plurality of groups and indicating whether an error region in which an error is detected is included in at least one of the plurality of storage regions of each of the plurality of groups, identify a first group including the error region from the plurality of groups based on the information associated with the plurality of groups, read data from a plurality of storage regions included in the identified first group, and identify the error region included in the first group based on the read data.

Abstract: A storage control apparatus that controls a plurality of storage devices, each of which includes a plurality of storage groups, the storage control apparatus includes a memory, a processor coupled to the memory and the processor configured to detect a first storage device from the plurality of storage devices, the first storage device having an area on which garbage collection is to be executed, identify a first storage group from the plurality of storage groups, the first storage group including the first storage device, prohibit write access to the plurality of storage devices included in the identified first storage group, and instruct the first storage device to execute the garbage collection.

Abstract: A control device is configured to receive a first write request of first data, calculate a first parity of the first data, store the first data and the first parity into a storage region so that the first data is stored redundantly, identify a certain area which has a possibility that a write process to the certain area is requested after a read process from the certain area is requested, receive a read request of the first data stored in the certain area, read the first data and the first parity, and store the first data and the first parity into a memory, receive a second write request of a second data, calculate a second parity based on the second data, the first data stored in the memory and the first parity stored in the memory, and store the second data and the second parity into the storage region.

Abstract: An apparatus stores recovery data of a fast recovery portion of storage data in different portions of a plurality of storages, and stores the recovery data in different fast recovery bands within a physical address range of each of the plurality of storages, where the physical address range is divided according to a size of the fast recovery portion. The apparatus transfers recovery data having different addresses from a redundancy set corresponding to a number of divisions in the physical address range to data transfer target storage.

Abstract: A storage control device configured to control a storage device includes a memory and a processor coupled to the memory and configured to receive a request of writing of data from an information processing device, assign a unit memory area in the storage device in response to the request of writing, determine whether a sequential format processing is to be executed on the unit memory area based on continuity of logical addresses designated by the request of writing, and determine a timing to execute the sequential format processing on the unit memory area based on a number of commands per unit time to the storage device when the sequential format processing is determined to be executed on the unit memory area.

Abstract: A storage control device configured to control a storage device includes a memory and a processor coupled to the memory and configured to receive a request of writing of data from an information processing device, assign a unit memory area in the storage device in response to the request of writing, determine whether a sequential format processing is to be executed on the unit memory area based on continuity of logical addresses designated by the request of writing, and determine a timing to execute the sequential format processing on the unit memory area based on a number of commands per unit time to the storage device when the sequential format processing is determined to be executed on the unit memory area.

Abstract: In a storage control apparatus, a control unit determines whether prefetching data on a first data amount basis from a plurality of storage devices to a storage unit causes an imbalance in the numbers of commands issued to the storage devices. When determining that the prefetching causes the imbalance, the control unit prefetches the data on a second data amount basis such as to balance the numbers of commands issued to the storage devices. With this approach, the storage control apparatus creates a different imbalance of the number of read commands issued for each execution of prefetch staging, so as to prevent a fixed imbalance in which more read commands are always issued to a specific storage device.

Abstract: A storage control apparatus, that controls a storage apparatus that includes a storage drive in which a plurality of logical volumes are set, includes a storage unit that stores load information for each of the plurality of logical volumes, and a control unit that determines to-be-rebuilt volumes, which are targets to be rebuilt, from the plurality of logical volumes, sequentially selects a logical volumes for which a volume-specific taken time is estimated, determines, for each selected logical volume, a volume-specific start time at which a rebuild will be started, estimates, by using the volume-specific start time and the load information about the selected logical volume, the volume-specific taken time for rebuilding the selected logical volume, and totals the volume-specific taken time estimated for each selected logical volume to calculate a total taken time taken for rebuilding the to-be-rebuilt volumes.

Abstract: A storage control device configured to control a storage device including a plurality of groups each of which includes a plurality of storage regions, the storage control device includes a memory and a processor coupled to the memory and configured to store, into the memory, information associated with each of the plurality of groups and indicating whether an error region in which an error is detected is included in at least one of the plurality of storage regions of each of the plurality of groups, identify a first group including the error region from the plurality of groups based on the information associated with the plurality of groups, read data from a plurality of storage regions included in the identified first group, and identify the error region included in the first group based on the read data.

Abstract: A control device that controls a reading process of information stored in a unit storage area under control of the control device and a unit storage area under control of a different control device in a distributed manner, the control device includes a processor. The processor executes a procedure including determining whether or not the reading process is a sequential reading process that reads information stored in a unit storage area under control of the control device in an order of logical addresses and whether or not a reading target area of the sequential reading process includes a last address in the unit storage area, and reporting to the different control device control information related to a sequential reading process including the last address determined by the first determination unit.

Abstract: A storage control apparatus starts, in a group of storage apparatuses that store constituent data that constitute redundant data in a distributed manner in units of a stripe, in regard to respective stripes of a plurality of stripes obtained from a group of target storage apparatuses excluding one of the storage apparatuses, a plurality of rebuilding processes for restoring the constituent data; decides, for each rebuilding process, a stripe for which the rebuilding process is to be performed next, according to access loads on the respective storage apparatuses of the group of target storage apparatuses; and obtains, for each rebuilding process, constituent data corresponding to the decided stripe from the group of target storage apparatuses and executing the rebuilding process, and executes the rebuilding process, to restore constituent data stored in the excluded storage apparatus from the obtained constituent data.

Abstract: A storage control apparatus includes a controller to, when more storage devices, among a plurality of storage devices across which a plurality of information areas storing information representing redundant data and one or more spare areas are distributed, than the number of the spare areas fail, perform a rebuild process of information stored in a plurality of information areas of a failed first storage device included in the plurality of combinations of the plurality of information areas and the one or more spare areas, the rebuild process including restoring information corresponding to one information area of the failed first storage device included in one combination among the plurality of combinations, and determining a write destination storage device to which the restored information is to be written in accordance with the number of times information is read from a non-failed second storage device.

Abstract: A storage control apparatus is communicatively connected to a storage device. The storage device includes a plurality of SSDs. The storage control apparatus includes a processing request controller and a device load detector. The device load detector detects an overload of an SSD by detecting a processing delay of the SSD. When the device load detector has detected an overload of an SSD, the processing request controller suppresses issuance of a request to process write-back with respect to a group by delaying issuance of the write-back.

Abstract: A CM 10 includes an unmount detector 142 and a mount detector 144 that monitor unmount and mount of each disk 21 of a RAID configuration, a write request manager 143 that manages a write request for writing data to a disk 21 that is unmounted, a consistency determination unit 145 that, when mount of a disk 21 of the RAID configuration is detected, makes a determination on consistency of the data of the disk 21 in which mount is detected on the basis of the managed write request, and a RAID incorporating unit that, when it is determined that the data lacks consistency, performs processing for recovering data expected to be written by the write request issued to the disk 21 in which mount is detected while the disk 21 is unmounted and incorporates the disk 21 in an original RAID configuration.

Abstract: In a storage control apparatus, a control unit determines whether prefetching data on a first data amount basis from a plurality of storage devices to a storage unit causes an imbalance in the numbers of commands issued to the storage devices. When determining that the prefetching causes the imbalance, the control unit prefetches the data on a second data amount basis such as to balance the numbers of commands issued to the storage devices. With this approach, the storage control apparatus creates a different imbalance of the number of read commands issued for each execution of prefetch staging, so as to prevent a fixed imbalance in which more read commands are always issued to a specific storage device.

Abstract: A control apparatus, that controls allocation of data in a logical volume so that the data is allocated so as to span a plurality of RAID groups, according to a predetermined allocation pattern, includes a storage unit that stores correspondence information that includes at least one changing condition under which an allocation pattern for the data is changed and a new allocation pattern; and a control unit that identifies an access trend for each of the plurality of RAID groups, decides whether the logical volume satisfies the at least one changing condition, according to the correspondence information and the identified access trend, and reallocates, if the changing condition is satisfied, the data included in the logical volume according to the new allocation pattern corresponding to that changing condition.

Abstract: A storage control device includes a control unit that calculates a stripe depth and a size of padding data, when writing target data is distributed and written to respective data storages of a storage device with a RAID configuration, based on a size of the writing target data and a number of the data storages in response to a writing request to a volume on the storage device, and writes the writing target data based on the calculated stripe depth and the calculated size of the padding data.

Abstract: A system that sets a logical volume in a first physical address region of a storage device including a plurality of memory areas, receives a write request to write data to a first logical address of the logical volume, calculates a difference between a first physical address corresponding to the first logical address and a head physical address of a first memory area of the plurality of memory areas, changes, based on the calculated difference, a first physical address region of the logical volume in the storage device to a second physical address region of the storage device, and writes the data to the first logical address of the logical volume set in the second physical address region of the storage device.