Abstract: Techniques perform storage management. The techniques involve: in response to a target request for a target redundant array of independent disks (RAID), determining that data in a first storage block associated with the target RAID needs to be moved or copied, wherein the target request includes one of the following: a restriping request, a type conversion request, or a rebalancing request; creating an intermediate RAID associated with an idle second storage block; and copying the data in the first storage block to a corresponding storage space in the intermediate RAID to write at least part of the data in the second storage block. Based on this mode, RAID restriping, type conversion, or rebalancing can be implemented efficiently.

Abstract: A backup-source storage system extracts, as a pattern, forwarding target data to a backup-destination storage system among data written to a storage apparatus through a volume. The backup-source storage system determines whether the extracted pattern matches with a registered pattern in the backup-source storage system. When a result of the determination is false, the backup-source storage system registers the extracted pattern and forwards the forwarding target data to the backup-destination storage system. When the result of the determination is true, the backup-source storage system does not forward the forwarding target data.

Abstract: Snapshots may be remotely replicated asynchronously from a first LSU (R1) on a first storage system (A) to a second replica LSU (R2) on a second storage system (A2). The storage system A1 may open a consistency window to suspend initiating processing of new write operations received on A1. While the consistency window is open, A1 may: take a first snapshot, SS11, of R1; record, in association with the first replication cycle, an indication to replicate SS11 on A2; and initiate a next replication cycle to record write operations of the next new write requests to be received from hosts. After initiating a next replication cycle, A1 may close the consistency and transmit the first replication cycle to A2. A2 may apply the write operations of the first replication cycle to R2, and then take a second snapshot SS12 of R2, which should be a replica of SS11.

Abstract: The present disclosure relates to systems and methods for data storage. The storage system may be operably connected to an imaging device. The storage system may include a first storage assembly configured to obtain and store data from the imaging device. The storage system may further include a second storage assembly operably connected to the first storage assembly. And the storage system may further include a processing device configured to control communication between the first storage assembly and the second storage assembly. A write speed of the first storage assembly may exceed a write speed threshold relating to at least two parameters of the imaging device. The at least two parameters may include a first speed at which the imaging device acquires scan data, and a second speed at which the scan data is transferred to the first storage assembly.

Abstract: In some examples, a system transfers, in a first transfer operation, data of a first storage volume of a first storage location to a second storage volume for a second storage location. Responsive to a completion of the transfer of data of the first storage volume to the second storage volume, the system activates tracking information to track changes to data portions of the second storage volume, the tracking information comprising a plurality of indicators that map to respective different data portions of the second storage volume. As part of a second transfer operation following the first transfer operation, the system transfers changed data indicated by the tracking information from the second storage volume to the first storage volume, without transferring unchanged data in the second storage volume to the first storage volume.

Abstract: The present disclosure relates to a method, an electronic device, and a computer program product for recovering data. For example, a method for recovering data is provided. The method may comprise acquiring metadata corresponding to to-be-recovered target data, the metadata comprising at least a first part of metadata corresponding to a first set of data blocks and a second part of metadata corresponding to a second set of data blocks. The method may further comprise acquiring, based on the first part of metadata, the first set of data blocks from a first backup storage device in a plurality of backup storage devices that store the target data. The method may further comprise acquiring, based on the second part of metadata, the second set of data blocks from a second backup storage device in the plurality of backup storage devices. In addition, the method may further comprise recovering the target data based on at least the first set of data blocks and the second set of data blocks.

Abstract: Techniques are provided for managing replication journals in a distributed replication system. A data replication system assigns an associated replication journal volume to each replication component operating on a storage node. Each replication component is configured to handle a portion of a replication workload which is distributed among the replication components, and to write journal data in the associated replication journal volume of the replication component. The data replication system performs a recovery process in response to detecting a failed replication component. The recovery process includes designating at least one replication component as a recovery replication component, designating the associated replication journal volume of the failed replication component as a recovery journal volume, and assigning the recovery journal volume to the recovery replication component to enable the recovery replication component to recover journal data in the recovery journal volume.

Abstract: Techniques are provided for caching data during an on-demand restore using a cloud block map. A client may be provided with access to an on-demand volume during a restore process that copies backup data from a snapshot within a remote object store to the on-demand volume stored within local storage. In response to receiving a request from the client for a block of the backup data not yet restored from the snapshot to the on-demand volume, the block may be retrieved from the snapshot in the remote object store. The block may be cached within a cloud block map stored within the local storage as a cached block. The client may be provided with access to the cached block.

Abstract: In a method of operating a memory controller, a decoding status flag is received from a memory module including a plurality of data chips and at least one parity chip. Each of the plurality of data chips and the at least one parity chip may include an on-die error correction code (ECC) engine. The decoding status flag is generated by the on-die ECC engines. A first number and a second number may be obtained based on the decoding status flag. The first number represents a number of first chips including an uncorrectable error that is uncorrectable by the on-die ECC engine. The second number represents a number of second chips including a correctable error that is correctable by the on-die ECC engine. At least one of a plurality of decoding schemes is selected based on at least one of the first number and the second number. A system ECC engine may perform ECC decoding on at least one of the first chips and the second chips based on the selected decoding scheme.

Abstract: Storage devices in a pool are divided into at least one group with a first number of storage devices in an existing group not higher than a range. When a second number of storage devices are added to the resource pool, a sum of the first number and the second number is determined. A new group is created based on at least a portion of the second number of storage devices when the sum does not satisfy the range; and another portion of the second number of storage devices are added to the existing group. A first storage space portion in each of a set of shared storage devices selected from the existing group is allocated to the existing group, and a second storage space portion in each of the set of shared storage devices is allocated to the new group. The storage space utilization rate can be increased.

Abstract: The operational performance and the I/O performance of Snapshots in a storage system are balanced. In a storage system, meta information of data appended to a log structured area is composed of meta information of a first tier and meta information of a second tier which correlate location information of data in a logical volume and location information of data in the log structured area. When creating a snapshot of the logical volume, a data management unit creates, in the same meta information area as a replication source, a replication of the meta information of the first tier stored in a plurality of meta information areas assigned to a plurality of controllers. A data control unit accesses the data of the log structured area from the logical volume, and accesses the data of the log structured area from the snapshot.

Abstract: An apparatus includes a storage area signal generation circuit configured to generate a storage area signal when performing an internal information storage operation and an external information storage operation; and an information storage circuit configured to receive internal failure information, stored in the apparatus, based on the storage area signal and store the received internal failure information as failure information in a set storage capacity, and store external failure information, applied from outside the apparatus, as the failure information in a variable storage capacity.

Abstract: An inventory of computer resources requiring backup data protection including an estimate of future growth of storage resources along with a set of data retention policies, rules, and outcomes in conformance with business requirements, is created. An architecture for initial ingest of protected data and a backup execution approach is created, based on the resource inventory, a sizing and assumptions of resources and data, and the set of data retention policies, rules, and outcomes. An initial ingest copies the protected data to the backup storage. The initial ingest architecture is transformed to a steady-state ingest phase, by incrementally adjusting the resources based on progress of the initial ingest. Responsive to completing the initial ingest of protected data, a steady-state backup ingest is performed. A validity of the sizing and assumptions of architecture resources is determined and an adjustment to the resources is performed based on the validity determination.

Abstract: Techniques for avoiding race conditions in high availability (HA) storage systems that employ disk array enclosures (DAEs). The techniques include receiving a notification of an input/output (IO) error from a storage node, in which the IO error occurs subsequent to the storage node issuing, to a first DAE controller, an IO operation to access data at a logical address of a storage device. The techniques further include, in response to the notification of the IO error, issuing, over an out-of-band channel, a flush command to the first DAE controller, causing data stored in cache memory of the first DAE controller to be written to the storage device, and receiving, over the out-of-band channel, an acknowledgement of completion of the flush operation from the first DAE controller. The techniques further include sending a notification of the completion of the flush operation to the storage node.

Abstract: A method for generating a crash-consistent backup of a source volume includes designating certain blocks of an operating source volume to be copied to a target volume, copying the designated blocks from the source volume to the target volume; initiating a time-based tracking process and detecting writes to blocks of the source volume. Using the time-based tracking process to maintain a time-ordered list of blocks that are written to during the copying of blocks to the target volume and to determine when the blocks on the target volume are in a sane state that permits a crash-consistent backup. After the designated blocks are copied, using the time-ordered list to continue copying blocks to the target volume. After the time-tracking process determines the blocks on the target volume are crash consistent (i.e., in a sane state), a snapshot can be transferred to a backup volume and time-tagged as a crash-consistent backup.

Abstract: A controller for controlling a memory device may include: an end-to-end decoder suitable for correcting an error in the unit user data and the corresponding end-to-end parity; an internal encoder suitable for generating a data chunk by adding a first internal parity to the source word which includes the unit user data and the end-to-end parity from the end-to-end decoder and buffering the source word into a buffer; an integrity checker suitable for determining whether an error is included in the source word, by using the end-to-end parity from the end-to-end decoder; and a parallel parity generator suitable for receiving the source word from the buffer according to a result of the determination, and completing a parallel parity based on a predetermined number of source words received, wherein the internal encoder is further suitable for generating a parity chunk by adding a second internal parity to the completed parallel parity.

Abstract: Exemplary memory storage system and methods for distributive storage of data. Exemplary embodiments provide methods and systems including a plurality of nodes where each node has memory for storing data. The nodes may be configured to receive data and store the data at the node if the data is intended for the node or pass the data to another node if the data is not intended for the node. The nodes may manage memory and allocation of specific memory addresses locally, while the system of nodes manages memory based on a naming convention to indicate the nodes and not the individual memory addresses within a node.

Abstract: The present disclosure includes apparatuses and methods related to a memory protocol with command priority. An example apparatus can execute a command that includes a read identification (RID) number based on a priority assigned to the RID number in a register. The apparatus can be a non-volatile dual in-line memory module (NVDIMM) device.

Abstract: Technologies are provided to ensure integrity of erasure coded data that is subject to read and write access from distributed processes. Multiple processes that access erasure coded data can be coordinated in an efficient, scalable and fault-tolerant manner so that integrity of the original data is maintained. The Technologies include a fault-tolerant access coordination protocol that ensures exclusive write access by a client. The coordination protocol achieves scalability by not relying on centralized components, and achieves efficiency and performance by piggy-packing access coordination messages on operations of the underlying erasure coding protocol.

Abstract: A method, computer program product and computer system are provided. A processor receives a host input/output write operation, wherein the host input/output write operation includes host metadata regarding data represented by the host input/output write operation. The processor stores the host input/output write operation in one or more physical storage data units. A processor assigns a priority to the one or more physical storage data units. In response to receiving a host volume delete command associated with at least one of the one or more physical storage data units, a processor prioritizes data units of the host volume for deletion based, at least in part, on the assigned priority of the data units of the host volume, wherein data units with a lower priority are permanently deleted before data units with a higher priority.