Abstract: A control module for a multi-level data storage device having a plurality of memory devices is disclosed. The control module may include: an access determination circuit configured to determine that access has been made to a piece of data stored on at least one of the plurality of memory devices, the piece of data associated with a level being one of a first level, a second level, or a third level; a level management circuit configured to change the level from the third level to the second level or from the second level to the first level upon determining that access has been made to the piece of data; and a memory controller configured to promote the piece of data in response to whether the level is the first level, the second level or the third level, wherein at least two levels of the first level, the second level, and the third level are associated with one of the plurality of memory devices.

Abstract: A method for data stripping, allocation and reconstruction in an active drive storage system including a plurality of active object storage devices, each of the plurality of active object storage devices including one or more storage devices and a controller is provided. The method includes the controller of the identified one of the plurality of active object storage devices segmenting the received data into a plurality of data chunks and generating one or more parity chunks in response to the plurality of data chunks. The method further includes the controller of the identified one of the plurality of active object storage devices reorganizing the plurality of data chunks and the one or more parity chunks in response to a number of the plurality of data chunks and a number of the one or more of the plurality of active object storage devices into which the received data is to be stored.

Abstract: A control module for a multi-level data storage device having a plurality of memory devices is disclosed. The control module may include: an access determination circuit configured to determine that access has been made to a piece of data stored on at least one of the plurality of memory devices, the piece of data associated with a level being one of a first level, a second level, or a third level; a level management circuit configured to change the level from the third level to the second level or from the second level to the first level upon determining that access has been made to the piece of data; and a memory controller configured to promote the piece of data in response to whether the level is the first level, the second level or the third level, wherein at least two levels of the first level, the second level, and the third level are associated with one of the plurality of memory devices.

Abstract: According to various embodiments, a storage device may be provided. The storage device may include: a first memory including a magnetic recording medium and configured to store user data; a second memory including a solid state drive recording medium and configured to store at least one of metadata or other frequently accessed data; and an interface configured to access the second memory using a pre-determined communication protocol.

Abstract: A method for defining an erasure code for system having a predetermined number of data disks is disclosed. The method includes selecting step, constructing step, determining step and repeating step. The selecting step includes selecting a predetermined acceptable number of failures for the system. The constructing step includes constructing a first Tanner graph for two failures acceptable system having predetermined number of data disks. The determining step includes determining erasure code from the first Tanner graph. The repeating step includes repeating the constructing step and the determining step by increasing the acceptable number of failures by one and constructing another Tanner graph in response to the increased acceptable number of failures by increasing number of parity nodes until the predetermined number of failures for the system is reached.

Abstract: A method for data stripping, allocation and reconstruction in an active drive storage system including a plurality of active object storage devices, each of the plurality of active object storage devices including one or more storage devices and a controller is provided. The method includes the controller of the identified one of the plurality of active object storage devices segmenting the received data into a plurality of data chunks and generating one or more parity chunks in response to the plurality of data chunks. The method further includes the controller of the identified one of the plurality of active object storage devices reorganizing the plurality of data chunks and the one or more parity chunks in response to a number of the plurality of data chunks and a number of the one or more of the plurality of active object storage devices into which the received data is to be stored.

Abstract: A data storage device includes a data storage medium having a plurality of data blocks. A cache includes a plurality of cache blocks. Each cache block includes a corresponding cache block address. A metadata table includes a plurality of table entries for the data blocks, respectively. Each of the table entries is configured to store the cache block address of one of the cache blocks in which data of a corresponding one of the data blocks is written. A bitmap is configured to store statuses of all of the cache blocks, respectively.

Abstract: Described are systems and methods for implementation in relation to hard disk drives. The disclosure is direct, at least in part, to a method for writing data in a multiple actuator multiple disk system, and the multiple actuator disk system for performing that method. The method comprises receiving the data and dividing the data into at least a first predetermined portion and a second predetermined portion. The method also includes and writing the first predetermined portion of the data onto a first disk surface of the multiple actuator multiple disk system using a first actuator of the multiple actuators while writing the second predetermined portion of the data onto a second disk surface of the multiple actuator multiple disk system using a second actuator of the multiple actuators.

Abstract: A method for data reconstruction when one HOSD has failed in a cluster of Hybrid Object Storage Devices (HOSDs) is disclosed. The method includes receiving one of a read request and a write request from a server to access data from a failed one of the plurality of storage devices and reconstructing the requested data stored in the failed one of the plurality of storage devices from portions of data stored in one or more available ones of the plurality of storage devices. The method also includes sending the requested data from the reconstructed data back to the server and sending the reconstructed data to a replacement one of the plurality of storage devices. Finally, the method includes updating a reconstruction list to indicate the replacement one of the plurality of storage devices and completion of data reconstruction.

Abstract: A method for data storage in a hybrid storage node of a data storage system is provided. The hybrid storage node includes first and second storage devices having different performance characteristics wherein the first devices includes at least one high performance non-volatile memory for cache storage. The hybrid storage node further includes processing resources for managing data storage in the hybrid storage node. The method includes receiving a read request to read stored information from the hybrid storage node and, in response to the read request, accessing both the cache storage first storage devices and storage in the second storage devices to locate the stored information.

Abstract: According to various embodiments, a server may be provided. The server may include: a first memory configured to store data of a first kind; a second memory configured to store data of a second kind; a wireless transceiver configured to transmit data stored in the first memory and data stored in the second memory, and configured to receive data; and a memory selection circuit configured to determine whether to store the received data in the first memory or to store the received data in the second memory.

Abstract: An active storage system is disclosed. The active storage system includes a storage device, a non-volatile memory and an active drive controller. The active drive controller performs data management and/or cluster management within the active storage system, the active drive controller including a data interface for receiving at least object and/or file data.

Abstract: A method for defining an erasure code for system having a predetermined number of data disks is disclosed. The method includes selecting step, constructing step, determining step and repeating step. The selecting step includes selecting a predetermined acceptable number of failures for the system. The constructing step includes constructing a first Tanner graph for two failures acceptable system having predetermined number of data disks. The determining step includes determining erasure code from the first Tanner graph. The repeating step includes repeating the constructing step and the determining step by increasing the acceptable number of failures by one and constructing another Tanner graph in response to the increased acceptable number of failures by increasing number of parity nodes until the predetermined number of failures for the system is reached.

Abstract: A printed circuit board assembly (PCBA) for a storage device comprising a non-volatile memory (NVM) and a multi-core processor, wherein a first core of the multi-core processor is devoted to external interface management and a second core of the multi-core processor is devoted to internal data management.

Abstract: A data storage device includes a data storage medium having a plurality of data blocks. A cache includes a plurality of cache blocks. Each cache block includes a corresponding cache block address. A metadata table includes a plurality of table entries for the data blocks, respectively. Each of the table entries is configured to store the cache block address of one of the cache blocks in which data of a corresponding one of the data blocks is written. A bitmap is configured to store statuses of all of the cache blocks, respectively.

Abstract: A data storage device includes a data storage medium, a cache, and a cache control memory. The data storage medium has M data blocks. M is an integer greater than 1. The cache includes N cache blocks having N cache block addresses, respectively. N is an integer greater than 1. The cache control memory includes M memory elements corresponding to the M data blocks, respectively. The cache control memory is configured to, in response to a request to cache data of one of the M data blocks: (a) write the data from the one of the M data blocks to one of the N cache blocks; and (b) write, in the one of the M memory elements corresponding to the one of the M data blocks, one of the N cache block addresses corresponding to the one of the N cache blocks where the data is written.

Abstract: Data reconstruction in a RAID storage system, by determining if a parity stripe has been reconstructed and if the parity stripe has been allocated, by the checking of a reconstruction/rebuild table and a space allocation table. Before reconstruction of a parity stripe occurs, the non-volatile memory of a failed hybrid drive is checked to determine if it is accessible and if so the data is copied to the new hybrid drive instead of reconstruction occurring.

Abstract: A data storage device includes a data storage medium, a cache, and a cache control memory. The data storage medium has M data blocks. M is an integer greater than 1. The cache includes N cache blocks having N cache block addresses, respectively. N is an integer greater than 1. The cache control memory includes M memory elements corresponding to the M data blocks, respectively. The cache control memory is configured to, in response to a request to cache data of one of the M data blocks: (a) write the data from the one of the M data blocks to one of the N cache blocks; and (b) write, in the one of the M memory elements corresponding to the one of the M data blocks, one of the N cache block addresses corresponding to the one of the N cache blocks where the data is written.

Abstract: In various embodiments, a data storage system may be provided. The data storage system may include a storage. The storage may include a first portion and a second portion. The data storage system may further include a determination circuit configured to determine whether to write data to the first portion or to the second portion. The data storage system may also include a control circuit configured to control writing the data to the first portion in a log structured manner.

Abstract: A data storage device is provided. The data storage device includes a data storage medium having a plurality of data blocks, a cache having a plurality of cache blocks, wherein each cache block is identified by a cache block address, a cache control memory including a memory element for each data block configured to store the cache block address of the cache block in which data of the data block is written.