Abstract: A system, method, and machine-readable storage medium for restoring a data object for a specified active time period are provided. In some embodiments, the method includes receiving, by a storage device from a client, a request specifying an active time period for a data object to remain stored on an accessible tier. The method also includes determining, by the storage device, that the active time period has elapsed. The method further includes responsive to a determination that the active time period has elapsed, sending, by the storage device, a request to a server storing the data object to move the data object from the accessible tier to an archive tier. Data objects that are stored on the accessible tier are accessible by the client, and data objects that are stored on the archive tier are inaccessible by the client.

Abstract: Example implementations relate to virtual persistent volumes. In an example, a storage virtualization system receives performance metrics related to usage of a virtual persistent volume by a containerized application. The performance metrics are identified in an application data store profile, and the application data store profile is identified based on an application manifest of the containerized application. The virtual persistent volume is modified based on an analysis of the performance metrics.

Abstract: In response to a request to store new data at a memory location of a bitwise programmable non-volatile memory, data stored at the memory location of the bitwise programmable memory is sensed. The bits of the sensed data are compared with bits of the new data. An indication of a cost difference is determined between a first burst of bitwise programming operations associated with programming bits of the new data which are different from bits of the sensed data, and a second burst of bitwise programming operations associated with programming bits of a complementary inversion of the new data which are different from bits of the sensed data. One of the first burst of bitwise programming operations or the second burst of bitwise programming operations is executed based on the generated indication of the cost difference.

Abstract: A technique for performing load balancing between storage nodes includes generating a first performance metric for volumes accessed through a first storage node and generating a second performance metric for volumes accessed through a second storage node. The volumes accessed through the first storage node include a set of volumes that belong to a NAS (network-attached storage) file server hosted by the first storage node. In response to detecting a load imbalance based on the first performance metric and the second performance metric, the technique further includes moving the NAS file server from the first storage node to the second storage node and hosting the set of volumes that belong to the NAS file server from the second storage node.

Abstract: A processing system includes a processor core for processing instructions and a memory that stores a page table set including an extended page table having an extended page table entry storing extended page table attributes associated with a physical memory page. The system receives a virtual address and translates the virtual address to a physical address for the physical memory page. One or more extended page attributes associated with the physical memory page are retrieved from the extended page table entry based on the virtual address.

Abstract: A system includes a hardware circuitry having a device coupled with one or more external memory devices. The device is to detect an input/output (I/O) request associated with an external memory device of the one or more external memory devices. The device is to record a first timestamp in response to detecting the IO request transmitted to the external memory device. The device is further to detect an indication from the external memory device of a completion of the IO request associated with the external memory device and record a second timestamp in response to detecting the indication. The device is also to determine a latency associated with the IO request based on the first timestamp and the second timestamp.

Abstract: Described herein are techniques and mechanisms for migrating data in a flexible and platform-independent manner that does not require installation on a customer site to be executed. In some embodiments, a software tool may be written in a scripting language, which may be interpreted at run-time as opposed to requiring compilation beforehand. The tool may include multiple modules, where each module may be configured to perform one or more specific functions in accordance with the invention, and each module may be capable of receiving and outputting data in a flat-file format, for example, with comma-delimited values. The software tool may present a command-line interface (CLI) that enables a user to specify execution of one or more actions by entering commands on a command line.

Abstract: A memory system includes nonvolatile physical memory, such as flash memory, that exhibits a wear mechanism asymmetrically associated with write operations. A relatively small cache of volatile memory reduces the number of writes, and wear-leveling memory access methods distribute writes evenly over the nonvolatile memory.

Abstract: Systems and methods for pre-fetching data based on memory usage patterns. An example method comprises: receiving a first memory access request identifying a first memory block; receiving a second memory access request identifying a second memory block; update a memory access tracking data structure by incrementing a sequence counter corresponding to a memory access sequence that references the first memory block and the second memory block; receive a third memory access request identifying a third memory block; identifying, based on the memory access tracking data structure, a sequence counter having a maximal value among sequence counters associated with memory access sequences that reference the third memory block; and pre-fetching a fourth memory block corresponding to the identified sequence counter.

Abstract: An apparatus comprises a processing device configured to obtain information characterizing historical boot times for virtual machines associated with virtual volumes hosted on a storage cluster comprising a plurality of storage nodes, and to determine, based at least in part on the obtained information, whether any of the storage nodes has at least a threshold likelihood of experiencing a designated virtual machine boot condition during a given time period. The processing device is further configured, responsive to determining that a first one of the storage nodes has at least the threshold likelihood of experiencing the designated virtual machine boot condition during the given time period, to identify a subset of the virtual machines associated with a subset of the virtual volumes hosted on the first storage node and to move at least one of the subset of the virtual volumes to a second one of the storage nodes.

Abstract: The present memory restoration system enables a collection of computing systems to prepare inactive rewritable memory for reserve and future replacement of other memory while the other memory is active and available for access by a user of the computing system. The preparation of the reserved memory part is performed off-line in a manner that is isolated from the current user of the active memory part. Preparation of memory includes erasure of data, reconfiguration, etc. The memory restoration system allows for simple exchange of the reserved memory part, once the active memory part is returned. The previously active memory may be concurrently recycled for future reuse in this same manner to become a reserved memory. This enables the computing collection infrastructure to “swap” to what was previously the inactive memory part when a user vacates a server, speeding up the server wipe process.

Abstract: A method, computer program product, and computing system for allocating a first number of tokens from a plurality of tokens for processing read IO requests from a read IO queue, thus defining a number of allocated read tokens. A second number of tokens may be allocated from the plurality of tokens for processing write IO requests from a write IO queue, thus defining a number of allocated write tokens. It may be determined that the processing of the write IO requests is throttled. In response to determining that the processing of the write IO requests from the write IO queue is throttled, a maximum allowable number of write tokens may be defined. Additional tokens may be allocated for processing the read IO requests from the read IO queue based upon, at least in part, the maximum allowable number of write tokens and the number of allocated write tokens.

Abstract: Various embodiments provide for one or more processor instructions and memory instructions that enable a memory sub-system to predict a schedule for migrating data between memory devices, which can be part of a memory sub-system.

Abstract: A processing device in a memory system determines a rate at which an amount of valid data is decreasing on a first block of the memory device and determines whether the rate at which the amount of valid data is decreasing on the first block satisfies a threshold criterion. Responsive to the rate at which the amount of valid data is decreasing on the first block satisfying the threshold criterion, the processing device performs a media management operation on the first block of the memory device.

Abstract: Techniques for predicting the outcome of a storage management operation on a hyper-converged infrastructure (HCI) deployment are provided. In one set of embodiments, a computer system can retrieve a current storage resource state of the HCI deployment. The computer system can then execute a simulation of the storage management operation in view of the current storage resource state, where the executing includes performing one or more simulated data movements between one or more host systems in the HCI deployment. Upon completing the simulation, the computer system can generate a report including, among other things, a predicted result status of the storage management operation based on the simulation.

Abstract: In various examples, a computing device of a dispersed storage network (DSN) receives a store data request including a data object. The computing device identifies a storage unit pool associated with the store data request. The storage unit pool includes a plurality of storage sets, each of the storage sets associated with a plurality of address ranges that are associated with a respective set of memories of the storage set. The computing device identifies a first set of memories of a first storage set of the storage unit pool, and issues a set of write slice requests to the first set of memories to initiate storage of encoded data slices produced from the data object. When an unfavorable storage condition is detected, the computing device identifies a second set of memories of the first storage set and facilitates storage of the data object in the second set of memories.

Abstract: Systems, methods, and computer program products are provided for reducing the size of image level backups. An example method receives backup parameters identifying a physical or Virtual Machine (VM) to backup and at least one file system object to include in the backup. The method connects to production storage corresponding to the selected physical or virtual machine and obtains access to data stored in disk corresponding to the selected file system object(s). The method fetches file allocation table (FAT) blocks from the disk and parses contents of the FAT blocks to determine if the disk blocks correspond to the selected file system object(s). The method creates a backup disk image FAT comprising blocks corresponding to the selected file system object(s). The method creates a reconstructed disk image FAT blocks corresponding to the backup FAT and disk image data blocks belonging to the selected file system object(s) and all other disk image data blocks are saved as zero blocks.

Abstract: A computer-implemented method according to one embodiment includes, prior to executing a point-in-time copy job, running a space checker program to generate a list that includes: source data sets that will be used in the point-in-time copy job and a pool of potential target volumes that are eligible to be used for the point-in-time copy job. The method further includes determining that insufficient space is available on the potential target volumes to perform the point-in-time copy job. An on-demand migration is issued against one or more target volumes of the pool of potential target volumes for ensuring there is sufficient space available on the one or more target volumes associated with the issued on-demand migration to perform the point-in-time copy job. The method further includes performing the point-in-time copy job.

Abstract: A first backend housekeeping operation of a backend storage system is detected by a storage virtualization system. The first backend housekeeping operation is related to a first backend storage portion of the backend storage system. The storage virtualization system transfers data to the backend storage system for storage and retrieval. The storage virtualization system issues commands to the backend storage system. A first virtualized operation related to a first virtualized storage portion of the storage virtualization system is identified. A storage overhead condition is determined based on the first backend storage portion and based on the first virtualized operation. A storage corrective action is performed based on the storage overhead condition. The storage corrective action prevents the potential performance of one or more additional backend housekeeping operations.

Abstract: Data encrypted using a first device-specific key of a first host device is written to a first logical storage device of a storage system. The storage system generates a copy of the first logical storage device, and associates the copy of the first logical storage device with a second logical storage device of the storage system. Data encrypted using a second device-specific key of a second host device is written to the second logical storage device of the storage system. Responsive to a request from the second host device for particular data of the second logical storage device, the storage system determines if the particular data was encrypted using the first key or the second key, and provides the second host device with the particular data and an indication of a result of the determination.