Abstract: Exemplary systems and methods for archiving data objects using secondary copies are disclosed. The system creates one or more secondary copies of primary data that contains multiple data objects. The system may maintain a first data structure that tracks the data objects for which the system has created secondary copies and the locations of the secondary copies. To archive data objects in the primary data, the system identifies data objects to be archived, verifies that previously-created secondary copies of the identified data objects exist, and replaces the identified data objects with stubs. The system may maintain a second data structure that both tracks the stubs and refers to the first data structure, thereby creating an association between the stubs and the locations of the secondary copies.

Abstract: A FLASH controller includes a main control module; and an arbitration module, a read data fifo, and a write data fifo connected with the main control module. The read data fifo and the write data fifo are both connected with the arbitration module and a data interface module, and the data interface module is connected with an AHB data bus. The controller further includes a register module that is connected with the read data fifo, the write data fifo, the arbitration module, and a configuration interface module. The configuration interface module is connected with an AHB configuration bus, and the main control module is connected with the register module through a synchronization module. The AHB data bus interface and the AHB configuration bus interface are adopted for different operations, and general read-write operations of FLASH are realized through DMA data transfer and high-capacity internal cache units, improving data transfer efficiency.

Abstract: To improve performance of a storage system. The storage system includes a plurality of storage nodes that communicate via a network. Each of the plurality of storage nodes includes one or more controllers. At least one controller in the controllers specifies at least two controllers that allocate a cache sub-area where write data is stored based on a controller that receives the write data from a host and a controller that processes the write date, and the cache sub-area is allocated in the specified controllers.

Abstract: A storage network operates by: encoding, via a dispersed error encoding, at least one data object as a write threshold number of encoded data slices; storing the write threshold number of the encoded data slices in a set of storage units of the storage network; determining when, due to a failure of at least one of the set of storage units, less than a pillar width number of the encoded data slices of a common revision are retrievable from the set of storage units: retrieving a decode threshold number of the encoded data slices from others of the set of storage units; decoding the decode threshold number of the encoded data slices to reproduce the at least one data object; restoring availability of the pillar width number of the encoded data slices of the common revision by: rebuilding at least a subset of encoded data slices of the set of encoded data slices, based on an encoding of the at least one data object; and storing the at least a subset of encoded data slices in the storage network.

Abstract: A storage device management method for a storage device is provided. The method includes periodically obtaining a current device temperature corresponding to the storage device via a temperature sensor of the storage device; accumulating a first count value in response to determining that the current device temperature is greater than a first temperature threshold; adjusting the first temperature threshold in response to determining that the first count value is greater than the first count threshold; accumulating a second count value in response to determining that the current device temperature is greater than a second temperature threshold; adjusting the second temperature threshold in response to determining that the second count value is greater than the second count threshold; and controlling the storage device to enter a target system state in response to determining that the current device temperature is not less than a critical temperature threshold.

Abstract: Methods and systems for processing input/output (“I/O”) requests are disclosed. One method includes identifying, a the target, a granular size to split a write request into a plurality of write requests, based on utilization of a processor of the target configured to process input/output (I/O) requests, the granular size indicating a number of the plurality of write requests; generating, by the target, a plurality of read requests to a storage server, each read request corresponding one of the plurality of write requests; issuing, by the target, the plurality of write requests to a storage device controller, in response to receiving data for the plurality of read requests from the storage server; and transmitting, by the target, a completion notification indicating completion of the write request to the storage server, in response to the storage device controller writing data for each of the plurality of write requests.

Abstract: Methods, systems, and devices for coherency locking are described in which different types of writes have different coherency locking schemes. The types of writes can be associated with different sources of write commands, such as external commands from a host system or internal commands from a garbage collection procedure. Coherency locking can be performed for external write commands received from a host system, while coherency locking is not performed for internal write commands. If an internal write is received for data that has been previously written at a prior location, a write to one or more physical memory devices can be performed and, once an acknowledgment is received that the write is complete, an update to a mapping table with the new location of the data is performed.

Abstract: A method for maintaining fault tolerance in a storage cluster is provided. Embodiments include receiving, by a management component associated with a distributed data store on a cluster of host machines, a request to place a first host machine of the cluster of host machines in a maintenance mode, wherein the first host machine stores given data of the distributed data store. Embodiments include determining whether a second host machine that does not currently store any data of the distributed data store exists in the cluster of host machines. Embodiments include determining, based on whether the second host machine exists in the cluster of host machines, whether to transfer the given data of the distributed data store from the first host machine to the second host machine. Embodiments include initiating the maintenance mode on the first host machine.

Abstract: A first data item is programmed to a first set of logical units of a memory sub-system. The first set of logical units is associated with a first fault tolerant stripe. A second data item is programmed to a second set of logical units of a memory sub-system. The second set of logical units is associated with a second fault tolerant stripe. A first set of redundancy metadata corresponding to the first data item and a second set of redundancy metadata corresponding to the second data item is generated. A combined set of redundancy metadata is generated based on at least the first set of redundancy metadata and the second set of redundancy metadata. The combined set of redundancy metadata is stored at a specified memory device of the memory sub-system.

Abstract: Method and apparatus for managing data in a storage device, such as a solid-state drive (SSD). In some embodiments, a main memory has memory cells arranged on dies arranged as die sets accessible using parallel channels. A controller is configured to arbitrate resources required by access commands to transfer data to or from the main memory using the parallel channels, to monitor an occurrence rate of collisions between commands requiring an overlapping set of the resources, and to adjust a ratio among different types of commands executed by the controller responsive to the occurrence rate of the collisions. In further embodiments, the controller may divide a full command into multiple partial commands, each of which are executed as the associated system resources become available. In some cases, the ratio is established between read commands and write commands issued to the main memory.

Abstract: Methods and systems for processing input/output (“I/O”) requests are disclosed. One method includes identifying, a the target, a granular size to split a write request into a plurality of write requests, based on utilization of a processor of the target configured to process input/output (I/O) requests, the granular size indicating a number of the plurality of write requests; generating, by the target, a plurality of read requests to a storage server, each read request corresponding one of the plurality of write requests; issuing, by the target, the plurality of write requests to a storage device controller, in response to receiving data for the plurality of read requests from the storage server; and transmitting, by the target, a completion notification indicating completion of the write request to the storage server, in response to the storage device controller writing data for each of the plurality of write requests.

Abstract: A memory controller can include a front end portion configured to interface with a host, a central controller portion configured to manage data, a back end portion configured to interface with memory devices. The memory controller can manage memory devices according to different protocols. For a first protocol, the memory device performs error correction operations and for a second protocol, the memory controller performs error correction operations. For the first protocol, error correction information, error detection information, and/or metadata is exchanged between the memory devices and the memory controller via data pins. For the second protocol, error correction information, error detection information, and/or metadata is exchanged between the memory devices and the memory controller via data mask inversion pins. The second protocol can have some features disabled that are enabled according to the first protocol, such as low-power features.

Abstract: A set of blocks of a storage device are allocated for storage of data, wherein the set of blocks of the storage device is selected based on a power requirement that is based on a number of partially programmed blocks stored in the cache. Subsequent data to be stored at the storage device is assigned to the set of blocks for storage at the storage device.

Abstract: A file storage system configured to use a second storage system includes a first file system provided to an application, a first storage system in which a file is stored by the first file system, a processor, state management information storing a state of the file, a state information management unit that manages the state management information, and a file virtualization unit that manages files stored in the first storage system and the second storage system. The processor performs a calling process of the first file system based on an operation request of the file from the application. The first file system processes the operation request of the file. The state information management unit performs a state management information update process of the file based on input information with respect to the first file system related to the operation request, or an operation content.

Abstract: A computer-implemented method for remote direct memory access (RDMA) by a distributed storage node includes receiving a request for an input/output (I/O) process associated with data. In response to the request, a memory segment shared between the operating system and a user process is allocated using an operating system driver of the node. The user process includes an I/O stack for processing the request. The shared memory segment includes a context memory portion storing context information associated with the I/O stack, a header memory portion storing header information for the I/O process, and a data memory portion for storing the data. The shared memory segment is registered for RDMA access with a target storage node. An RDMA transfer is performed between the shared memory segment and the target node to complete the I/O process. The shared memory segment is deallocated upon completion of the RDMA transfer.

Abstract: A virtualized copy-by-reference includes: receiving, from a first computer system, a request for reference information for source data within a source volume; providing, to the first computer system, the reference information, wherein the reference information corresponds to a metadata representation of the source data; receiving, from a second computer system, a request to write the source data to a target volume, and wherein the request to write the source data indicates the reference information; and copying, using the reference information, the metadata representation of the source data to the target volume.

Abstract: Disclosed are a distributed block storage service command processing method, apparatus, a device and a medium. The method includes: by means of tgtadm, acquiring a rbd command of a block storage service, parsing the rbd command to obtain a corresponding task parameter, and then transmitting the task parameter to an ISCSI target (S11); by means of tgtd, starting a dedicated thread for processing a task corresponding to the task parameter, and monitoring a real-time processing result of the current task (S12); and returning the real-time processing result to the tgtadm by means of the ISCSI target, whereby the tgtadm displays the real-time processing result on a human-computer interface (S13).

Abstract: The present disclosure relates to methods and systems for evaluating a storage medium. The method may include receiving, via a user interface of a host, a user request to evaluate a storage medium coupled to a first controller. The method may also include determining whether there is a first binding history table associated with the storage medium stored in the host. In response to a determination that there is no first binding history table stored in the host, the method may include retrieving a binding history table from the storage medium via the first controller and determining the storage medium as a second-hand storage medium if there is at least one second controller different from the first controller in the binding history table.

Abstract: A memory controller managing a memory device receives a memory read command from a host device that is communicably coupled to the memory device. The memory device includes a storage memory comprising a first type of memory cells and a cache memory comprising a second type of memory cells. The memory controller determines, from the memory read command, a physical address of a target memory location in the storage memory indicated by the memory read command. The memory controller executes a read operation on the target memory location corresponding to the physical address. The memory controller determines a read attribute of the target memory location. Conditioned on determining that the read attribute satisfies one or more threshold conditions, the memory controller programs an entry in the cache memory with information corresponding to the target memory location.

Abstract: A data path connection can be established between a target of a remote source system and an initiator of a local destination system. A storage object of the remote source system exposed over such a data path connection can be mapped to a local storage object name of the local destination system. Such a remote storage object of the remote source system can be accessed as a local storage object of the local destination system using the local storage object name. Within the destination system, the local storage object name of the destination system can be used as a proxy to access the remote storage object of the remote source system. Accessing the remote storage object from the destination system can be used in several data mobility use cases, including, but not limited to, offloaded data copy across arrays, snapshot mobility and backup use-cases.