Patent application number | Description | Published |
20080215810 | RAID CONTROL APPARATUS AND CONTROL METHOD THEREFOR - A RAID control apparatus and control method. The RAID control apparatus includes disk devices and disk control devices including a cache memory that stores cache data of a logical unit, and control unit, upon the logical units present in different disk devices being concatenated to each other, switching in-charge disk control devices such that a disk control device is in charge of access to the concatenated logical units without writing back the cache data stored in a cache memory of a source disk control device to the disk device. | 09-04-2008 |
20090063766 | STORAGE CONTROLLER AND FIRMWARE UPDATING METHOD - A storage controller and method are provided. The storage controller includes control sections including storage sections into which data transmitted from a host unit is cached, one of the control sections being a main control section which controls firmware update in the control sections. The main control section includes an instruction updater sending an update instruction to a sub control section in the control sections in which firmware is to be updated, and an area instructor requesting the sub control section to transmit area information, the sub control section including an area information obtainer obtaining, according to the instruction from the area instructor and an area information transmitter transmitting to the area instructor; and an area setter setting the location of the cache area in the storage section on the basis of the instruction. | 03-05-2009 |
20100217932 | STORAGE APPARATUS AND STORAGE CONTROL APPARATUS - A storage apparatus includes a copy control unit for managing a copy session for copying an copy source data area in at least one of the first to the Mth copy source disk groups to an copy destination data area in a corresponding copy destination disk group, setting a first to an Mth copy session groups, each of the copy session groups including one or more copy sessions from the ith copy source disk group to the ith copy destination disk group as the copy session, and performing repeatedly a selection operation for cyclically selecting a copy session from each of the first to the Mth copy session groups in a predetermined sequence and a control operation for cyclically executing copy processing on a predetermined copy processing unit basis for the M copy sessions selected by the selection operation in a predetermined sequence for a prescribed number of times. | 08-26-2010 |
20120239882 | CONTROL APPARATUS AND METHOD, AND STORAGE APPARATUS - In a storage apparatus, in the case where a data block to be written to a storage medium is a zero data block containing only zero data, a zero data information memory stores zero data identification information indicating that the data block is a zero data block. A control apparatus receives a data block from an access requesting apparatus in association with a write request issued by the access requesting apparatus for writing the data block a specified number of times to a predetermined storage area of the storage medium, and when determining that the data block is a zero data block containing only zero data, sets zero data identification information in the zero data information memory, and when completing the setting of the zero data identification information, sends the access requesting apparatus a completion notice of the writing to the storage medium. | 09-20-2012 |
20130205111 | VIRTUAL STORAGE DEVICE, CONTROLLER, AND COMPUTER-READABLE RECORDING MEDIUM HAVING STORED THEREIN A CONTROL PROGRAM - A virtual storage device including a releasable region decider that decides whether each of a plurality of management unit regions is a releasable region, being allocated a physical region and being a release candidate region, by referring to management data that associates allocation data representing a state of allocating a physical region to the management unit region and release candidate region data representing whether the management unit region is a release candidate region with each other; a determinator that determines whether the management unit region decided to be the releasable region by the releasable region decider is an all-zero region all data in which are zero; and a releaser that releases allocation of a physical region allocated to the management unit region determined to be the all-zero region by the determinator. This configuration makes it possible to efficiently use the storage region. | 08-08-2013 |
20140297988 | STORAGE DEVICE, ALLOCATION RELEASE CONTROL METHOD - A storage device that allocates an unused physical storage area to logical storage areas to which write has been requested by an upper device, the storage device including a pattern test unit that tests whether a data pattern written to each of the logical storage areas is a data pattern indicating that allocation of the physical storage area is needed, a skip control unit that determines a skip object for which the pattern test unit does not perform the test among the logical storage areas being test objects of the pattern test unit, and excludes the skip object from the test objects, and a release control unit that releases allocation of a physical storage area to a logical storage area, tested by the pattern test unit, to which the data pattern indicating that allocation of the physical storage area is not needed. | 10-02-2014 |
20140372720 | STORAGE SYSTEM AND OPERATION MANAGEMENT METHOD OF STORAGE SYSTEM - A policy determining unit determines an allocation method for blocks on the basis of information on a hierarchical policy stored in a policy management table and information on a volume stored in a volume management table. Then, on the basis of the determination result performed by the policy determining unit, a first allocating unit performs allocation on the basis of the specified capacity and a second allocating unit performs allocation on the basis of the specified percentage for each volume. | 12-18-2014 |
20150161043 | STORAGE CONTROL APPARATUS AND STORAGE CONTROL METHOD - 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. | 06-11-2015 |