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, less than a pillar width number of the encoded data slices 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 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 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.

Abstract: A method for execution by one or more processing modules of a storage network begins by receiving an access request for a set of encoded data slices, where the data object is segmented into a plurality of data segments, a data segment of which is dispersed error encoded in accordance with dispersed error encoding parameters to produce the set of encoded data slices. The method continues by determining whether a revision for one or more encoded data slices in a first storage module is a most recent revision level for the one or more encoded data slices and when the one or more encoded data slices is a most recent revision level, determining whether the revision level for the one or more encoded data slices in a second storage module is the most recent revision level.

Abstract: A method for execution by a vault management device of a storage network includes determining a failure impact level to vaults of the storage network based on a failed storage unit within the vaults, where the vaults include a first vault that is associated with a first set of storage units and a first decode threshold number, and a second vault that is associated with a second set of storage units and a second decode threshold number, and where the failure impact level is based on the number of non-failed storage units within each of the vaults. The method continues with determining a failure abatement approach based on the failure impact level. The method continues by with facilitating the failure abatement approach.

Abstract: 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.

Abstract: A storage unit includes an interface configured to interface and communicate with a dispersed storage network (DSN), a memory that stores operational instructions, and processing circuitry. The storage unit receives a set of read slice requests for a set of encoded data slices (EDSs) associated with a data object stored within a first set of storage units, where the storage the first set of storage units includes the storage unit. When at least a read threshold number of EDSs and fewer than all of the set of EDSs can be successfully retrieved from the first set of storage units, the storage unit identifies at least one EDS associated with a data object that is stored in a second set of storage units, obtains the at least one EDS and stores the at least one EDS in the storage unit.

Abstract: Methods and apparatus for redirecting data access requests in a storage network are disclosed. In an embodiment, a computing device associated with the storage network performs a method that includes identifying a (second) storage pool of the storage network to replace a first storage pool of the storage network. The method includes issuing a migration message to at least one of the first storage pool or the second storage pool. The migration message initiates a replication of data from the first storage pool to the second storage pool. The method further includes receiving a write data request for the first storage pool prior to completion of the replication of the data, and forwarding the write data request to the second storage pool for further processing.

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 method includes acquiring, by a managing unit of a dispersed storage network (DSN), storage unit status information and data object storage status information from a plurality of storage units of DSN memory of the DSN. The method further includes determining, by the managing unit, DSN status information of the DSN memory based on the storage unit status information and the data object storage status information. The method further includes identifying, by the managing unit, DSN memory issues within the DSN memory. The method further includes prioritizing, by the managing unit, corrective remedies for the DSN memory issues based on the status information of the DSN memory. The method further includes facilitating, by the managing unit, the execution of the prioritized corrective remedies to correct the DSN memory issues.

Abstract: A method for execution by a rebuilding module includes detecting that less than a pillar width number of encoded data slices of a common revision are retrievable from a set of storage units. A decode threshold number of encoded data slices are retrieved and decoded to reproduce a data segment. The data segment is encoded to produce at least one encoded data slice and storage of the at least one encoded data slice in the set of storage units is facilitated in accordance with the common revision when determining to rebuild the at least one encoded data slice. The data segment is encoded to reproduce the set of encoded data slices and storage of the reproduced set of encoded data slices is facilitated in the set of storage units in accordance with a new revision when determining to not rebuild the at least one encoded data slice.

Abstract: Systems and methods for selectively disabling power to disk drives in a distributed storage network (DSN). In embodiments, a method includes: monitoring namespace health parameter data in a DSN including a plurality of storage disk drives, wherein the namespace health parameter data includes available disks of the plurality of storage disk drives; determining that power to a subset of the plurality of storage disk drives can be disabled without disrupting anticipated client access to a data collection based on the monitoring and stored power management rules; and sending instructions to at least one power manager within the DSN to disable power to the subset of the plurality of storage disk drives, resulting in at least one disabled storage disk, wherein the instructions are based on the determining that power to the subset of the plurality of storage disk drives can be disabled.

Abstract: A method for determining to rebuild a namespace. The method includes one or more computer processors identifying a set of storage devices associated with the namespace of the user. The method further includes determining a state of health of a namespace based on information related to the set of storage devices associated with the namespace and further includes identifying a set of criteria related to the state of health of the namespace. The method further includes responding to determining that one or more criteria related to the state of health of namespace attains respective trigger values by replacing a first set of storage devices that store data corresponding to the namespace and are included among one or more storage systems. The method further includes dictating to replace the first set of storage devices that store data corresponding to the namespace and are included among the one or more storage systems.

Abstract: A method begins with a processing module transmitting list slice requests to distributed storage network (DSN) storage units regarding storage errors associated with a data segment. The method continues with the processing module receiving list slice response messages and depending on the list slice response messages, determining whether a first threshold priority or a second threshold priority number of error-free EDSs associated with the first data segment has been stored. The method proceeds with the processing module, depending on the number of error-free EDSs associated with the first data segment that have been stored, issuing read slice requests and rebuilding one or more EDSs associated with the data segment.

Abstract: A method for execution by a vault management device of a storage network includes determining a failure impact level to vaults of the storage network based on a failed storage unit within the vaults, where the vaults include a first vault that is associated with a first set of storage units and a first decode threshold number, and a second vault that is associated with a second set of storage units and a second decode threshold number, and where the failure impact level is based on the number of non-failed storage units within each of the vaults. The method continues with determining a failure abatement approach based on the failure impact level. The method continues by with facilitating the failure abatement approach.

Abstract: A method includes detecting, by a vault management device, a failed storage unit common to a first vault and a second vault. The first vault is associated with a first set of storage units and the second vault is associated with a second set of storage units. The failed storage unit is in each of the first and second sets of storage units. The method further includes identifying a number of non-failed storage units of the first and second sets of storage units and comparing the number of non-failed storage units with first and second decode threshold numbers to determine a failure impact level. The first decode threshold number is associated with the first vault and the second decode threshold number is associated with the second vault. The method further includes determining a failure abatement approach based on the failure impact level and facilitating the failure abatement approach.

Abstract: Systems and methods for selectively disabling power to disk drives in a distributed storage network (DSN). In embodiments, a method includes: monitoring namespace health parameter data in a DSN including a plurality of storage disk drives, wherein the namespace health parameter data includes available disks of the plurality of storage disk drives; determining that power to a subset of the plurality of storage disk drives can be disabled without disrupting anticipated client access to a data collection based on the monitoring and stored power management rules; and sending instructions to at least one power manager within the DSN to disable power to the subset of the plurality of storage disk drives, resulting in at least one disabled storage disk, wherein the instructions are based on the determining that power to the subset of the plurality of storage disk drives can be disabled.

Abstract: A method for dispositioning copies of data. The method includes one or more computer processors identifying data that has been added to a first data storage vault, of a set of data storage vaults, and the data is not stored in another vault. The method further includes determining a dictated number of copies of the data to create based on configuration information related to storing data within the set of data storage vaults. The method further includes creating the dictated number of copies of the data within the first vault. The method further includes assigning an expiration duration value to a first copy of data and the data. The method further includes responding to determining that the first copy data is stored within the first vault for a duration that exceeds the assigned expiration duration value, by deleting the first copy of the data from within the first vault.

Abstract: A method for determining to rebuild a namespace. The method includes one or more computer processors identifying a set of storage devices associated with the namespace of the user. The method further includes determining a state of health of a namespace based on information related to the set of storage devices associated with the namespace and further includes identifying a set of criteria related to the state of health of the namespace. The method further includes responding to determining that one or more criteria related to the state of health of namespace attains respective trigger values by replacing a first set of storage devices that store data corresponding to the namespace and are included among one or more storage systems. The method further includes dictating to replace the first set of storage devices that store data corresponding to the namespace and are included among the one or more storage systems.

Abstract: A computing device includes an interface configured to interface and communicate with a dispersed storage network (DSN), a memory that stores operational instructions, and processing circuitry. The computing device issues a set of write requests to a first storage unit (SU) set based on a set of encoded data slices (EDSs) associated with a data object to be stored therein. When a write threshold number and fewer than all of the set of EDSs have been successfully stored, the computing device determines to store temporarily within a second SU set remaining EDS(s) that has not been successfully stored within the first SUs set and facilitates temporary storage thereof within the second SU set. Upon recovery of the EDS(s) from the temporary storage within the second SU set, the computing device issues additional write request(s) to the first SU set based on the EDS(s).