Embodiments for accessing data are provided. A method of accessing data comprises: receiving a request to access first data in a storage device, at least a part of data in the storage device being cached in a cache, and index information of the at least a part of data being recorded in an index structure associated with the cache; querying the index structure to determine whether the first data is cached in the cache; and accessing the first data based on a result of the query. Embodiments of the present disclosure can improve data accessing efficiency while saving memory consumption.

Techniques are provided for adaptive look-ahead configuration for data prefetching. One method comprises, in response to a request for a data item in a storage system: obtaining a size of a look-ahead window for the request based on one of multiple available caching policies; and moving the requested data item and additional data items within the look-ahead window to the cache memory when the requested data item and/or the additional data items within the look-ahead window account recovery are not in the cache memory. The multiple available caching policies comprise a caching policy based on characteristics of an input/output workload of the storage system, or a portion thereof; and/or a caching policy based on an input/output workload of at least a portion of the storage system within a prior predefined time window. The look-ahead window size may be varied over time.

An image formation apparatus includes a first non-volatile memory, a second non-volatile memory smaller in allowable number of times of rewriting of data than the first non-volatile memory and higher in rate of reading of data than the first non-volatile memory, and a processor. The processor backs up control data for the image formation apparatus to the first non-volatile memory, backs up the control data to the second non-volatile memory less frequently than to the first non-volatile memory, and reads the control data from the second non-volatile memory when the control data stored in the first non-volatile memory matches with the control data stored in the second non-volatile memory at the time of start-up of the image formation apparatus and otherwise reads the control data from the first non-volatile memory.

The present invention provides a temporary memory processing method including: receiving a write command including a write data and a write address; determining whether a corresponding temporary address is in a missed state to generate a determined result; and determining whether to write the write data into a corresponding buffer address of a buffer memory according to the determined result.

A system and method improve the performance of non-volatile memory storage by offloading parity computations to facilitate high speed data transfers, including direct memory access (DMA) transfers, between a remote host and a non-volatile memory based storage system, such as a flash memory based data storage device (e.g., SSD). In conjunction with writing to non-volatile memory storage, a stripe map is used to target a selected data storage device for parity generation. All data of a stripe is transmitted to the selected data storage device to generate the parity and the generated parity is propagated from the selected data storage device to other data storage devices in the stripe. The data for the stripe may also be propagated from the selected data storage device to the other data storage devices in the stripe.

A storage system capable of dynamically securing free space when a certain storage apparatus is disused and reducing the influence on the system upon dynamically securing the free space without having to continuously secure, in a memory of another storage apparatus, free space capable of storing management information of the corresponding storage apparatus in preparation of a case where such storage apparatus is disused. Each storage apparatus comprises a memory including a management information storage area for storing management information and a cache area for storing cache information, and a processor which manages a status of the cache area. At least certain processors determine a storage apparatus to become a copy destination of the copy target management information. The storage apparatus of the copy destination releases at least a part of the cache area and stores the management information in the released cache area.

A type of data relocation to perform on a group of solid state storage cells is selected from a group that includes garbage collection and wear leveling. Source blocks in the group of solid state storage cells are identified using the selected type of data relocation. The source blocks are read in order to obtain relocated data and the relocated data is stored in an open block in the group of solid state storage cells. Relocated data associated with the selected type of data relocation is stored in the open block and relocated data associated with the unselected type of data relocation is excluded from the open block.

A system includes a memory and at least one processor to continually analyze at least one of metrics, events, and conditions in a computer network, under normal operating conditions in the computer network, obtain a first level of data from at least one hardware device in the computer network, detect that one of a condition and an event has occurred in the computer network, automatically transmit an instruction to modify the first level of data obtained from the at least one hardware device to a second level of data more robust than the first level of data when one of the condition and the event has occurred, collect the second level of data from the at least one hardware device, and store the second level of data obtained from the at least one hardware device.

Methods, systems, and devices related to a memory system or scheme that includes a first memory device configured for low-energy access operations and a second memory device configured for storing high-density information and operations of the same are described. The memory system may include an array configured for high-density information and may interface with a host via a controller and a cache or another array of a relatively fast memory type. The memory system may support signals communicated according to one or several modulation schemes, including a modulation scheme or schemes that employ two, three, or more voltage levels (e.g., NRZ, PAM4). The memory system may include, e.g., separate channels configured to communicate using different modulation schemes between a host and between memory arrays or memory types within the memory system.

Embodiments of the present disclosure provide a method and apparatus for providing data storage service. The method comprises: receiving a storage service template from an user, the storage service template specifying a storage service policy for the user and a service instance to launch; and providing a storage service according to the storage service template; wherein the storage service policy defines a storage function to be performed for data of the user. With the method and apparatus according to embodiments of the present disclosure, a unified solution for overall orchestration of storage functions can be provided to enable the user to customize the required storage function flexibly.