Patent application number | Description | Published |
20080201574 | Data encryption apparatus, data decryption apparatus, data encryption method, data decryption method, and data relay apparatus - A RAID system includes a RAID controller that sends to a disc apparatus data to be encrypted by a data relay apparatus connected to the RAID controller and the disk apparatus. When receiving a data transfer request packet indicating a first receivable size, the data relay apparatus establishes a second receivable size that is equal to or greater than the first receivable size and that is a multiple of an encryption data size. When the RAID controller receives a data transfer request packet containing the established second receivable size, and in response to the data transfer request packet thus received, the data relay apparatus receives data of the second receivable size sent from the RAID controller. The data relay apparatus also encrypts the received data in units of the encryption data size, and then the encrypted data is sent to the disk apparatus in units of the first receivable size. | 08-21-2008 |
20080209203 | Data encryption apparatus, data decryption apparatus, data encryption method, data decryption method, and data transfer controlling apparatus - A crypt processor is connected to a host computer and a storage apparatus. Data from the host computer is transferred to the crypt processor via DMA (Direct Memory Access) to be encrypted and then stored in the storage apparatus. The crypto processor acquires a descriptor defining a DMA number for identifying a DMA channel used to DMA-transfer the data. The crypto processor stores therein, based on the DMA number included in the acquired descriptor, the data transferred using the same DMA channel in units of a data size specified in a data bus. The crypto processor then encrypts the stored data in units of data size specified in a crypt system, and transfers the encrypted data to the storage apparatus. | 08-28-2008 |
20090077276 | DATA TRANSFER DEVICE, INFORMATION PROCESSING SYSTEM, AND COMPUTER-READABLE RECORDING MEDIUM CARRYING DATA TRANSFER PROGRAM - A data transfer device connected to data transfer destination via serial attached SCSI includes a plurality of buses. A queuing unit queues processing requests associated with data transfer. A transferring unit obtains data transferred associated with processing request upon receiving processing request and transfer obtained data to the destination by using one of the buses. A transmitting unit transmits processing request queued in the queuing unit to transfer unit. A detecting unit detects the number of processing requests. A determining unit determines whether the number of processing requests detected by the detecting unit is smaller than the number of buses. If the determining unit determines the number of processing requests is smaller than the number of buses, the transmitting unit divides the processing requests into a plurality of processing requests in accordance with the number of buses and the number of processing requests. | 03-19-2009 |
20090204760 | STORAGE APPARATUS, RELAY DEVICE, AND METHOD OF CONTROLLING OPERATING STATE - Each time any one of HDDs is accessed, a corresponding relationship between the disk address of the accessed HDD and the time information indicating a time at which the HDD is accessed is added to a first operating-state management table. When a corresponding relationship with the same disk address already exists in the first operating-state management table, the time information is updated. When the first operating-state management table has no space available for new entry, corresponding relationships are deleted from the one having the oldest time information. Only HDDs of which disk address is recorded in the first operating-state management table is turned on. | 08-13-2009 |
20100228930 | ACCESS CONTROL DEVICE, INFORMATION PROCESSING DEVICE, ACCESS CONTROL PROGRAM AND ACCESS CONTROL METHOD - An access control device which writes data to each of predetermined storage block sets in a storage device of which a storage area has been divided into a plurality of storage blocks. The control device includes a management information storage section and an access processing section. The management information storage section stores, for each of said storage blocks, record enable/disable information indicating whether said storage block is a non-defective block in which the data can be recorded or a defective block in which the data cannot be recorded. If the data is written to each of said storage block sets, the access processing section writes the data only to non-defective blocks in said storage block set based on the record enable/disable information stored in said management information storage section. | 09-09-2010 |
20100241806 | DATA BACKUP METHOD AND INFORMATION PROCESSING APPARATUS - An information processing apparatus includes, a first storage unit, a second storage unit in which data stored in the first storage unit is backed up, and a memory controller that controls data backup operation. The memory controller divides a transfer source storage area into portions, and provides two transfer destination areas, each of the two transfer destination areas being divided into portions, backs up data in a direction from a beginning address of each divided area of the transfer source storage area to an end address thereof in one of the transfer destination areas provided for each divided area of the transfer source storage area, and backs up data in a direction from the end address of each divided area of the transfer source storage area to the beginning address thereof in the other transfer destination storage area. | 09-23-2010 |
20100306570 | ASYNCHRONOUS INTERFACE CIRCUIT AND DATA TRANSFER METHOD - An asynchronous interface circuit for transferring a data stream between different clock domains, the asynchronous interface circuits includes a data holding circuit for sequentially receiving and transferring data of the data stream in synchronism with a first clock signal, and holding the received data until an input of a next data, an asynchronous memory for sequentially receiving the data held in the data holding circuit in synchronism with the first clock signal and for outputting the data in the order of inputting in synchronism with a second clock signal. The asynchronous interface circuit further includes a monitor for detecting an operating state of the asynchronous memory, and a selector for selecting one of the data output from the asynchronous memory and the data output from the data holding circuit on the basis of a detecting result of the monitor. | 12-02-2010 |
20100306586 | Storage apparatus and method of data processing - A storage apparatus includes a backup processing unit that stores data stored in a first memory into a second memory as backup data upon occurrence of a power failure, a restore processing unit that upon recovery from the power failure restores the backup data backed up in the second memory to the first memory and erases the backup data, and an erasure processing termination unit that terminates the erasure processing upon a power failure occurring during erasure processing for erasing the backup data stored in the second memory, and a re-backup processing unit that re-backs up data in the first memory corresponding to the backup data erased from the second memory before the erasure processing is terminated by the erasure processing termination unit to a location in the second memory subsequent to a last location that contains the backup data which has not been erased. | 12-02-2010 |
20100332739 | Storage device, storage controlling device, and storage controlling method - A storage device includes a programmable device into which predetermined control data is written, a control data storing unit that stores therein write control data and read control data, the write control data being control data for realizing a function to save data stored in a cache memory into a nonvolatile memory when an abnormal shut-down occurs and the read control data being control data for realizing a function to restore the data saved in the nonvolatile memory into the cache memory when an electric power source is turned on after the abnormal shut-down, a writing unit that, when an electric power source is turned on after occurrence of the abnormal shut-down of the storage device, writes the read control data into the programmable device, and a restoring instructing unit that instructs the programmable device to restore the data saved in the nonvolatile memory into the cache memory. | 12-30-2010 |
20110010499 | STORAGE SYSTEM, METHOD OF CONTROLLING STORAGE SYSTEM, AND METHOD OF CONTROLLING CONTROL APPARATUS - A storage system including a storage, has a first power supplier for supplying electronic power, a second power supplier for supplying electronic power when the first power supplier not supplying electronic power to the storage system, a cache memory for storing data sent out from a host, a non-volatile memory for storing data stored in the cache memory, and a controller for writing the data stored in the cache memory into the non-volatile memory when the second supplier supplying electronic power to the storage system, for stopping the writing and for deleting data stored in the non-volatile memory so until a free space volume of the non-volatile memory being not less than a volume of the data stored in the cache memory when the first supplier restoring electronic power to the storage system. | 01-13-2011 |
20120144268 | ACCESS CONTROL APPARATUS, STORAGE APPARATUS, AND METHOD - An access control apparatus for controlling an access to a storage device, the access control apparatus includes a measuring unit configured to measure the time to erase data stored in the storage device, and a determination unit configured to determine a data size of an error correcting code added to data stored in the storage device in accordance with the time measured by the measuring unit. The access control apparatus includes a generation unit configured to generate the error correcting code having the data size determined by the determination unit, and an access controller configured to write the data and the error correcting code generated by the generation unit into the storage device. | 06-07-2012 |
20120254636 | CONTROL APPARATUS AND CONTROL METHOD - A control apparatus includes a capacitor to store electric power supplied from the power supply unit and to supply the stored electric power to the control apparatus when the power supply from the power supply unit is stopped, a first nonvolatile memory, a second nonvolatile memory, a first controller, and a second controller. The first controller writes the data, stored in the cache memory, into the first nonvolatile memory when the external power supply is stopped verifies whether the data stored in the first nonvolatile memory is normal, and sends information of area where the data in the first nonvolatile memory is not normal when the verification indicates that the writing is not normal. And the second controller writes the information sent from the first controller into the second nonvolatile memory. | 10-04-2012 |
20120278688 | SEMICONDUCTOR DEVICE, INFORMATION PROCESSING APPARATUS, AND METHOD OF DETECTING ERROR - Each of (n−1) 2-bit checking units, where n is an integer larger than or equal to 4, receives n-bit redundant encoded data generated from 1-bit input data, and outputs 2-bit check data based on a result of comparison between bits of the encoded data, combinations of the bits differing in each comparison. An all-bit checking unit outputs all-bit check data based on exclusive ORs of all-bit of the encoded data. An error detecting unit detects errors in the encoded data on the basis of the (n−1) sets of 2-bit check data and the all-bit check data, and outputs the input data on the basis of the result of error detection. | 11-01-2012 |