摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
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:
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:
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:
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.
摘要:
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.