A method for execution by a computing device of a storage network begins by obtaining scoring information for a rebuilding encoded data slices for one or more storage units of a set of storage units of the storage network, where the scoring information includes two or more of a plurality of rebuilding rates, a plurality of input/output rates, a plurality of scores, and a plurality of selection rates. The method continues with determining a rebuilding rate of the plurality of rebuilding rates to utilize for the rebuilding based on the scoring information. The method continues by implementing the rebuilding of the encoded data slices in accordance with the rebuilding rate.

A solid state drive having a drive aggregator and multiple component solid state drives. The drive aggregator associates the host interfaces with different logical address spaces, interprets commands received from the host interfaces in the different logical address spaces, and implements the commands using the plurality of component solid state drives. Some of the host interfaces can be configured to share a common logical address space. Some of the logical address spaces can be configured to have an overlapping region that are hosted on the same set of memory units such that the memory units can be addressed in any of the logical address spaces having the overlapping region.

Disclosed are a method for data de-duplication and an apparatus for the same. The method may comprise obtaining access property of data based on input request or output request for the data, determining de-duplication unit of the data based on the access property, and performing de-duplication on the data based on the de-duplication unit. Thus, data de-duplication rate may be determined adaptively based on input/output characteristics of data. Also, data de-duplication may be performed based on the determined data de-duplication rate so as to provide low input/output latency.

A method for execution by one or more computing devices of a storage network includes obtaining performance impact information regarding a data reconstruction operation associated with a computing device of the one or more computing devices, where the data reconstruction operation is regarding reconstructing data at a first reconstruction rate of a plurality of reconstruction rates, and where the performance impact information includes performance metrics of the storage network affected by the data reconstruction operation. The method further includes determining a second reconstruction rate of the plurality of reconstruction rates to utilize for the data reconstruction operation based on the performance impact information to achieve a first performance metric of the performance metrics. The method further includes executing the data reconstruction operation in accordance with the second reconstruction rate.

A technique provides efficient data failover by creation and deployment of a protection policy that ensures maintenance of frequent common snapshots between sites of a multi-site data replication environment. A global constraint optimizer executes on a node of a cluster to create the protection policy for deployment among other nodes of clusters at the sites. Constraints such as protection rules (PRs) specifying, e.g., an amount of tolerable data loss are applied to a category of data designated for failover from a primary site over a network to a plurality of (secondary and tertiary) sites typically located at geographically separated distances. The optimizer processes the PRs to compute parameters such as frequency of snapshot generation and replication among the sites, as well as retention of the latest common snapshot maintained at each site to create a recovery point and configuration of the protection policy that reduces network traffic for efficient use of the network among the sites.

A region descriptor management method and an electronic apparatus are provided. The region descriptor management method is adapted to a device controller of the electronic apparatus and includes following steps. Region descriptor entries are fetched from a region descriptor table. Each of the region descriptor entries includes a block initial address and a block length to describe a memory block of a memory module. According to the block initial addresses and the block lengths of the region descriptor entries, a portion of the region descriptor entries are adjusted to be at least one current region descriptor entry. Based on the at least one current region descriptor entry, a current region descriptor table is generated.

Embodiments of the present invention disclose a data migration method for memory modules in a server and a server. By establishing a mirror relationship between agent apparatuses of two memory modules, a processor in the present invention instructs the agent apparatuses to perform data migration between the two memory modules, to complete migration of data from one memory module to the other memory module. The entire data migration process requires no participation of an operating system, and consumes a short period of time, thereby implementing convenient data migration for memory modules in a server.

A management server in a parallel data system stores a correspondence-relationship between a first response-time for communication-processing and a second response-time for data-processing, executed by each of a plurality of data servers in relation to first processing by a client node, acquires, at a time of execution of second processing by the client node, a third response-time desired for communication-processing and a fourth response-time desired for data-processing, which are related to second processing, in each of a plurality of data servers, based on the first response-time and the second response-time, determines combinations of the data servers used to execute the second processing, based on the third response-time and fourth response-time, and selects a combination that satisfies a response-time to be satisfied by the second processing and that includes a smallest number of processor cores allocated to the communication-processing of a data server, among the determined combinations.

A storage device utilizing internal compression codecs may reduce the overall amount of data required for storage within the memory devices, increasing storage device life spans and available storage space. Data provided to the storage device is compressed prior to storage and decompressed upon retrieval. The data may be formatted at a fixed length to streamline compression processing. The processing time of the compression codecs may be minimized through the use of hardware-based resources when needed. These compression codec storage devices may include one or more communication channels suitable for connection with a host, memory devices within a memory array, and controllers configured to transfer host data from the host-computing device to the memory array. Internal compression codecs can be configured to retrieve host data from one or more buffers, compress the host data with a fixed-input compression method, and store the compressed data within one or more memory devices.

A storage network operates by: generating metadata for a data object; first disperse storage error encoding the metadata to produce a set of metadata slices, wherein the first disperse storage error encoding utilizes first dispersal parameters, the first dispersal parameters including a first decode threshold of 1; generating sets of first data slices via a second disperse storage error encoding of data segments associated with the data object, wherein the second disperse storage error encoding utilizes second dispersal parameters, the second dispersal parameters different from the first dispersal parameters and the second dispersal parameters including a second decode threshold greater than 1; producing an additional data segment associated with the data object wherein the additional data segment is different from the data segments and the metadata; and third disperse storage error encoding the additional data segment to produce a set of second data slices, wherein the third disperse storage error encoding utilizes the first dispersal parameters including the first decode threshold of 1.