A system and method for offset protection data in a RAID array. A computer system comprises client computers and data storage arrays coupled to one another via a network. A data storage array utilizes solid-state drives and Flash memory cells for data storage. A storage controller within a data storage array is configured to store user data in a first page of a first storage device of the plurality of storage devices; generate intra-device protection data corresponding to the user data, and store the intra-device protection data at a first offset within the first page. The controller is further configured to generate inter-device protection data corresponding to the first page, and store the inter-device protection data at a second offset within a second page in a second storage device of the plurality of storage devices, wherein the first offset is different from the second offset.

A storage system includes a plurality of storage nodes. Each storage node of the plurality of storage nodes includes a plurality of non-volatile memory modules. The storage system also includes a processor operatively coupled to the plurality of storage nodes, to perform a method. The method includes receiving incoming data. The method further includes storing the incoming data in a redundant array of independent drives (RAID) stripe in the data storage system. The RAID stripe includes groups of data shards. Each group of data shards and a respective group parity shard are stored across the plurality of nodes of the data storage system. A set of stripe parity shards are stored in a first storage node of the plurality of storage nodes.

A redundant array of independent disks (RAID) storage device including; a memory device including first memory devices configured to store at least one of data chunks and corresponding parity (data chunks/parity) and a second memory device configured to serve as a spare memory region, and a RAID controller including a RAID internal memory configured to store a count table and configured to control performing of a rebuild operation in response to a command received from a host, wherein upon identification of a failed first memory device, the RAID controller accesses used regions of non-failed first memory devices based on the count table and rebuilds data of the failed first memory device using the second memory device.

A system and method for offset protection data in a RAID array. A computer system comprises client computers and data storage arrays coupled to one another via a network. A data storage array utilizes solid-state drives and Flash memory cells for data storage. A storage controller within a data storage array is configured to store user data in a first page of a first storage device of the plurality of storage devices; generate intra-device protection data corresponding to the user data, and store the intra-device protection data at a first offset within the first page. The controller is further configured to generate inter-device protection data corresponding to the first page, and store the inter-device protection data at a second offset within a second page in a second storage device of the plurality of storage devices, wherein the first offset is different from the second offset.

A storage control apparatus forms a RAID by plural storage media and stores and holds data on a file-by-file basis. A number-of-writable-times management unit manages the number of writable times for each storage medium. A write-destination management unit manages data write destinations in the storage media. When updating write object data whose write destination is one of storage media constituting a group (first storage medium), a relocation unit relocates the write object data by setting a write destination to a second storage medium which is different from the first storage medium. A write-destination update unit updates the data write destinations in the storage media managed by the write-destination management unit according to the relocating. Through the relocating, the storage control apparatus is able to control the number of writable times which decreases along with data writing.

A storage system includes a first information processor, a second information processor, and a superordinate device. The first information processor includes a first memory device that stores therein the data, a difference generator that generates difference data representing a difference between updating data received from the superordinate device and the data stored in the first memory device before updating, a second memory device stores therein the generated difference data, and a data transmitter that transmits the stored difference data to the second information processor. The second information processor includes a third memory device that stores therein the parity, a data receiver that receives the difference data transmitted from the data transmitter, and a parity difference applier that generates a post-updating parity that is to be written into the third memory device by applying the received difference data to the stored parity before the updating.

Methods and systems for enhanced error recovery are described. A first one or more data blocks to write to a first drive are received by a first drive controller module. A first parity block is calculated by the first drive controller module based on a first data block parity group. The first one or more data blocks are written by the first drive controller module to the first drive. The first parity block is written by the first drive controller module to the first drive.

Data is stored as a first collection of memory blocks distributed across a first set of memory devices. It is determined that a first memory device in the first set is in a degraded state. Data is recovered corresponding to a first memory block in the first collection of memory blocks that is stored in the first memory device, which is configured to include a first number of memory blocks. The recovered data is stored in a second memory device as a new memory block, which is added to the first collection of memory blocks. The first memory device is removed from the first set and reconfigured with a second number of memory blocks that is less than the first number of memory blocks. Memory blocks in a second collection of memory blocks distributed across a second set of memory devices is stored in the reconfigured first memory device.

According to an example, a resiliency group for a memory node in a memory network can provide error correction for a memory access in the memory node. The memory access may be received from a main memory controller of a processor connected to the memory network. The memory access may be executed by a memory controller of the memory node.

According to one aspect of the present invention, there is provided a method for performing storage control. Member storage media and a hot spare storage medium are identified in a storage system. The member storage media are members of a storage medium array, and the hot spare storage medium is for joining in the storage medium array when a member storage medium fails. Data on a member storage medium having a write amplification effect is migrated to the hot spare storage medium. In the member storage medium having a write amplification effect, an erase operation is performed on a storage medium where the migrated data is located. Embodiments of the present invention can alleviate adverse impact caused by a write amplification effect.