摘要:
A storage device is for restoring the data saved in a nonvolatile memory to a cache memory, even if there is not a read response from the nonvolatile memory. In a data saving operation, parity data of to-be-saved data is generated, and the to-be-saved data and the parity data having CRCs and AIDs added thereto are written into a flash memory. In a data restoring operation, if an operation to read data from the flash memory is not completed within a predetermined period of time, the data reading operation is suspended, and additional data is set. The to-be-saved data having a data error corrected with the parity data is then written into the cache memory.
摘要:
In a controller of a disk array device, when recovery from a power failure is detected, the controller instructs a reading section to transfer data in a burst mode using a large prefetch amount. When an error is detected, the controller causes the data to be transferred again for an area where the error is detected. Further, the controller designates different access ports for the reading section and an erasing section, and causes these sections to operate in parallel. The reading section reads cache data from a flash memory and stores the cache data in a cache memory. The erasing section uses the access port different from the access port of the reading section, to erase data that is stored in the flash memory and has been transferred by the reading section.
摘要:
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.
摘要:
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.
摘要:
A DMA circuit operates a plurality of DMA channels in parallel, enabling reduction of the circuit scale and fewer development processes. A channel manager circuit reads in sequence the control information for each DMA channel from control memory, performs analysis, and according to the divided DMA control sequence, performs state processing (DMA control). Further, the channel manager circuit updates the control information, writes back the control information to the control memory, and executes time-division control of the plurality of DMA channels. Hence the circuit scale can be reduced, contributing to decreased costs, and the number of development processes can be reduced.
摘要:
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.
摘要:
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.
摘要:
In a control apparatus, a write control unit controls operation of writing data to a non-volatile storage unit. The write control unit is configurable with given control data. A control data storage unit stores first control data for the write control unit. An input reception unit receives second control data for the write control unit. A configuration unit configures the write control unit with the first control data stored in the control data storage unit when the first control data has a newer version number than that of the second control data received by the input reception unit, and with the second control data when the second control data has a newer version number than that of the first control data.
摘要:
A DMA circuit operates a plurality of DMA channels in parallel, enabling reduction of the circuit scale and fewer development processes. A channel manager circuit reads in sequence the control information for each DMA channel from control memory, performs analysis, and according to the divided DMA control sequence, performs state processing (DMA control). Further, the channel manager circuit updates the control information, writes back the control information to the control memory, and executes time-division control of the plurality of DMA channels. Hence the circuit scale can be reduced, contributing to decreased costs, and the number of development processes can be reduced.
摘要:
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.