Abstract: A device power is supplied for running a storage device. When a device error occurs, a recovery operation is performed on the storage device. When the recovery operation fails, the device power is reset in a compatibility verification operation and the recovery operation is performed again on the storage device.

Abstract: In accordance with embodiments of the present disclosure, a method may comprise identifying one or more portions of the memory having defects. The method may also include storing one or more addresses in the memory defect list, each of the one or more addresses associated with a portion of the one or more identified portions. The method may further include indicating to components of an information handling system that the one or more identified portions are unusable such that the other components are prevented from allocating and using the one or more identified portions.

Abstract: A method begins by a processing module identifying a set of stored files that includes an original file and one or more back-up copies of the original file. The method continues with the processing module dispersed storage error encoding one of the set of stored files to produce a plurality of sets of encoded data slices. The method continues with the processing module facilitating storage of the plurality of sets of encoded data slices. The method continues with the processing module facilitating deletion of the set of stored files.

Abstract: A method for identifying, based on instructions stored externally to a processor containing a cache memory, a functional portion of the cache memory, then loading cache test code into the functional portion of the cache memory from an external source, and executing the cache test code stored in the cache memory to test the cache memory on a cache-line-granular basis and store fault information.

Abstract: A storage system includes plural storage devices, a controller configured to transmit an access request for controlling an access to at least one of the storage devices, a switching part configured to receive the access request from the controller to select the one of the storage devices based on the access request received from the controller, and a proxy response part configured to transmit, if the selected storage device has failed, a response to the access request instead of the failed storage device responding.

Abstract: Providing homogeneous recovery in a redundant memory system that includes a memory controller, a plurality of memory channels in communication with the memory controller, an error detection code mechanism configured for detecting a failing memory channel, and an error recovery mechanism. The error recovery mechanism is configured for receiving notification of the failing memory channel, for blocking off new operations from starting on the memory channels, for completing any pending operations on the memory channels, for performing a recovery operation on the memory channels and for starting the new operations on at least a first subset of the memory channels. The memory system is capable of operating with the first subset of the memory channels.

Abstract: A system and method for arbitrating exchange identifier assignments for I/O operations are disclosed. In an exemplary embodiment, the method comprises receiving, by a storage system, a data command from a host system. The data command is directed to a virtual device of the storage system, the virtual device comprising a plurality of physical devices of the storage system. A range of exchange identifier values are allocated to the data command. The range may include a predefined number of exchange identifiers, the predefined number determined prior to the receiving of the data command. A plurality of I/O operations corresponding to the data command are issued, where each of the plurality of I/O operations is directed to a physical device of the plurality of physical devices of the storage system. An exchange identifier within the range of exchange identifier values is associated with each of the plurality of I/O operations.

Abstract: A method for data storage includes storing data in a memory including multiple analog memory cells arranged in blocks. A first subset of the blocks is defined for storing first data with a first storage density, and a second subset of the blocks is defined for storing second data with a second storage density, larger than the first storage density. In each of the first and second subsets, one or more blocks are allocated to serve as spare blocks and blocks that become faulty are replaced with the spare blocks. Upon detecting that a number of the spare blocks in the second subset has decreased below a predefined threshold, the data is copied from at least one block in the second subset to the first subset, and the at least one block is added to the spare blocks of the second subset.

Abstract: A method begins by a processing module determining that a data storage request is a cloud data storage request. The method continues with the processing module determining at least one of a cloud storage access reliability indication and a cloud storage data reliability indication for the data storage request. The method continues with the processing module sending the data storage request and the at least one of cloud storage access reliability indication and cloud storage data reliability indication to a cloud storage system.

Abstract: A single segment data structure and method for storing data objects employing a single segment data object having a header and a data record. The header includes a segment length field describing the length of memory reserved for the data record and the data record contains at least one data instance object. Each of the data instance objects has a data instance header and data field. The header includes a data instance state field and a data instance length field. The data instance length field contains data representing the length of the data instance data field allowing for variable length “in place” updating. The data instance state field contains data representing an object state of the instance data. Only one of the data instance objects of the data record of the single segment data object has a valid object state. The state field facilitates a power loss recovery process.

Abstract: When a double failure occurs in a storage device storing a mutual conversion table such as a track management information table in thin provisioning, the storage address of the track within the storage subsystem cannot be specified and user data is lost. In order to solve the problem, the present invention provides a storage subsystem capable of recovering data by referring to a track address stored in an accessible track management information table or a user data section, renewing the damaged track management information table to restore the corresponding relationship between track management information tables, and enabling the user data to be accessed again.

Abstract: Data re-protection in a distributed replicated data storage system is disclosed. The method may be implemented on a server or controller. A method includes storing first data in a first zone and storing a replica of the first data in a second zone. The zones are at different, separate locations. When an actual or impending failure with the first data in the first zone is detected, the system automatically initiates transitioning to a copy of impacted data at the first zone obtained from the second zone. The transitioning includes creating a remote copy of the impacted data at the second zone within a local area network before transferring the copy to the first zone over a wide area network. The methods allow the system to return to a fully protected state faster than if the impacted data was transferred from the second zone to the first zone without making a copy at the second zone.

Abstract: A technique is provided for a cache. A cache controller accesses a set in a congruence class and determines that the set contains corrupted data based on an error being found. The cache controller determines that a delete parameter for taking the set offline is met and determines that a number of currently offline sets in the congruence class is higher than an allowable offline number threshold. The cache controller determines not to take the set in which the error was found offline based on determining that the number of currently offline sets in the congruence class is higher than the allowable offline number threshold.

Abstract: A token value is maintained based on an allowable number of low power transitions of a hard disk drive without adversely affecting reliability, compared to an actual number of low power transitions of said hard disk drive. The allowable number of low power transitions increases over the hard disk drive's lifetime. Before the hard disk drive performs a low power transition, the token is evaluated to determine if the hard disk drive is allowed to perform a low power transition. Low power transitions discussed include parking the head and spinning-down the hard disk drive.

Abstract: The invention provides a data access method of a memory device. In one embodiment, the memory device comprises a plurality of memories. First, a plurality of commands sequentially received from a host is stored in a command queue. A target command is then retrieved from the command queue. A target memory accessed by the target command is then determined. Whether the target memory is in a busy state is then determined. When the target memory is not in a busy state, access operations requested by the target command are then performed. When the target memory is in a busy state, a substitute command is selected from a plurality of subsequent commands stored in the command queue and access operations requested by the substitute command are performed, wherein the sequence of the subsequent commands in the command queue is subsequent to the target command.

Abstract: Methods, apparatus and computer program products implement embodiments of the present invention that enable digital information devices having respective storage devices and memories to distributedly store, for a logical volume, data and first and second parity values across corresponding regions of the storage devices. Freezers having a one-to-one correspondence with the storage devices are distributedly stored in the memories. Upon detecting, in a cache, updated data for one or more first regions on the storage devices, existing data from the one or more first regions, and additional data for parity calculations are retrieved from one or more corresponding second regions on the storage devices, and first and the second parity values are calculated using the updated data, the existing data and the additional data. The updated data and the calculated first and second parity values are stored to the freezers, and then destaged from the freezers to the storage devices.

Abstract: A computing system stores actual memory usage data in a user memory space. The actual memory usage data represents memory usage of a plurality of device drivers that are loaded by a first kernel. The computing system generates an estimate of memory space to be reserved for a second kernel based on the actual memory usage data for the plurality of device drivers that are loaded by the first kernel and reserves memory space for the second kernel using the estimate.

Abstract: A data processing device includes a cache having a plurality of cache lines. Each cache line has a lockout state that indicates whether an error has been detected for data accessed at the cache line. The lockout state of a cache line is indicated by a set of one or more lockout bits associate with the cache line. When a cache line is in a locked-out state, the cache line is not used by the cache. Accordingly, a locked-out cache line is not employed by the cache to satisfy a cache accesses, and is not used to store data retrieved from memory in response to a cache miss. In response to determining the detected error likely did not result from a hardware failure or other persistent condition, memory error management software can reset the lockout state of the cache line.

Abstract: At least one node of a plurality of nodes in an information processing apparatus executes the following processing for data included in a memory of one node or other nodes and stored in a shared memory area which the node and the other nodes access. That is, the node detects an ICE which occurs over a predetermined number of times within a predetermined time or a PCE which occurs at a single location in the shared memory area. When the error is detected, the node performs control to prevent the node and the other nodes from accessing the shared memory. The node recovers the data in a memory area different from the shared memory area. The node notifies information about the different memory area to the other nodes. The node performs control to resume the access to the data from the node and the other nodes.

Abstract: Multiple copy sets of data are maintained on one or more storage devices. Each copy set includes at least some of the same data units as other sets. Different sets optionally have data units stored in different orders on the storage device(s). A particular one of the sets of data is selected as the set to be accessed in response to detecting a particular scenario.

Abstract: A hybrid storage device that includes a hard-disk drive (HDD) and a flash memory is described. When control logic in the hybrid storage device receives a request from an external device to write a block of data to a logical address in a first portion of an address space that maps to the HDD, the control logic writes the block of data to the HDD. However, if there is a change in environmental state information of the hybrid storage device during the write operation, the control logic writes at least a portion of the block of data to a logical address for the block of data in a second portion of the address space which maps to the flash memory. Note that the address space may be common to the external device and the hybrid storage device.

Abstract: A method and system is used in managing drive error information. An error is detected in connection with a drive. Error data associated with the drive error is collected in response to detecting the error. The error data is stored on the drive. The error data being sufficiently complete to allow a comprehensive evaluation of the error.

Abstract: Error correction is carried out on first data stored in an external memory after determining that the first data contains a correctable error. Prior to starting the error correction of the first data, other accesses to the first data are blocked. Thereafter, the first data is corrected and overwritten by the corrected data (second data). After storing the second data in the external memory, accesses to the second data are permitted.

Abstract: According to one embodiment, a memory controller includes a plurality of operation units respectively provided for a plurality of stages and each performing an error correcting operation for data supplied from an external device or data read from a nonvolatile semiconductor memory.

Abstract: One embodiment of the present invention is a parallel processing unit (PPU) that includes one or more streaming multiprocessors (SMs) and implements a selective fault-stalling pipeline. Upon detecting a memory access fault associated with an operation executing on a particular SM, a replay unit in the selective fault-stalling pipeline considers the operation as a faulting operation. Subsequently, instead of notifying the SM of the memory access fault, the replay unit recirculates the operation—reinserting the operation into the selective fault-stalling pipeline. Recirculating faulting operations in such a fashion enables the SM to execute other operation while the replay unit stalls the faulting request until the associated access fault is resolved. Advantageously, the overall performance of the PPU is improved compared to conventional PPUs that, upon detecting a memory access fault, cancel the associated operation and subsequent operations.

Abstract: A memory module includes a bridge controller having a first interface and a second interface. The first interface receives commands and data from a host and the second interface is coupled to one or more memory components. The bridge controller performs multiple-bit error detection and correction on data stored in the one or more memory components.

Abstract: Embodiments of the invention provide a device and method for warm booting whereby data restoration occurs at the powering-on of the host, and can therefore be performed by the boot disk. Specifically, when the system is powered on, a backup controller will send a notification to a DMA controller indicating the data restoration is needed. The backup controller will automatically resorts contents of a backup storage device to main memory. During the process, when the host requests data, the DMA controller reads the data from the backup storage unit and sends it to the host. Then, once data restoration is complete, normal operations can commence.

Abstract: According to the presently disclosed subject matter there is provided, inter alia, a system and method which enable to identify, in a storage-system, malfunctioning disks, and in response, to activate a power-cycle process only for the specific failing disks, in order to bring these disks into proper operational mode. During the power-cycle process of a failing disk, other disks, which are not failing, remain operative and available.

Abstract: An SSD controller maintains a zero count and a one count, and/or in some embodiments a zero/one disparity count, for each read unit read from an SLC NVM (or the lower pages of an MLC). In an event that the read unit is uncorrectable in part due to a shift in the threshold voltage distributions away from their nominal distributions, the maintained counts enable a determination of a direction and/or a magnitude to adjust a read threshold to track the threshold voltage shift and restore the read data zero/one balance. In various embodiments, the adjusted read threshold is determined in a variety of described ways (counts, percentages) that are based on a number of described factors (determined threshold voltage distributions, known stored values, past NVM operating events). Extensions of the forgoing techniques are described for MLC memories.

Abstract: Described herein is a system and method for retaining deduplication of data blocks of a resulting storage object (e.g., a flexible volume) from a split operation of a clone of a base storage object. The clone may comprise data blocks that are shared with at least one data block of the base storage object and at least one data block that is not shared with at least one data block of the base storage object. The data blocks of the clone that are shared with the base storage object may be indicated to receive a write allocation that may comprise assigning a new pointer to a indicated data block. Each data block may comprise a plurality of pointers comprising a virtual address pointer and a physical address pointer. As such, data blocks of the clone comprising the same virtual address pointer may be assigned a single physical address pointer. Thus, a new physical address pointer is assigned or allocated once to a given virtual address pointer of data blocks of a clone.

Abstract: In one aspect, a method includes forming a virtualized grid consistency group to replicate a logical unit, running a first grid copy on a first data protection appliance (DPA) replicating a first portion of the logical unit, running a second grid copy on a second DPA replicating a second portion of the logical unit, sending IOs to the first DPA if the IOs are to a first set of offsets and sending IOs to the second DPA if the IOs are to a second set of offsets.

Abstract: A Firmware Over-The-Air (FOTA) based data update method and a mobile terminal of supporting the same are provided. The FOTA based data update method for a mobile terminal includes loading a pre-boot file stored in a second memory in a pre-boot loading area of a first memory, identifying version information of a first version bootloader file stored in a first bootloader file area and a second version bootloader file stored in a second bootloader file area, loading a newer version bootloader file, corresponding to a new one of the first version bootloader file and the second version bootloader file, in a bootloader loading area of the first memory, loading, upon bootloader file activation, a FOTA engine and activating the FOTA engine, and updating, upon FOTA engine activation, a bootloader file area storing the older version bootloader file on the basis of received boot related data.

Abstract: A method, computer program product, and storage network system for detecting a failure of a highly-available, volatile, solid state cache memory system included within a storage network. The highly-available, volatile, solid state cache memory system includes cache data. The cache data is replicated onto a non-volatile, solid-state, cache memory system included within the storage network. At least one data request concerning the highly-available, volatile, solid state cache memory system is redirected to the non-volatile, solid-state, cache memory system.

Abstract: A storage integrity system in a dispersed storage network scans an address range of data slices to identify errors in one of a plurality of encoded data slices, wherein the plurality of encoded data slices are generated from a data segment using an error encoding dispersal function. When the storage integrity system detects an error, it identifies one of the encoded data slices for rebuilding. The identified data slice is rebuilt in response to the type of error. For example, when the type of the error includes a temporary error, the storage integrity system waits a predetermined time period to determine whether the error still exists prior to rebuilding the identified data slice.

Abstract: Methods, systems, and products mirror data between local memory and remote storage. A write command is sent from a server to a remote storage device, and a timer is established. A current time of the timer is compared to a maximum time period. If the maximum time period expires without receipt of an acknowledgment to the write command, then a write error is assumed to exist to the remote storage device.

Abstract: A disk drive receives a request to write at least one block of a first block size, wherein the disk drive is configured to store blocks of a second block size that is larger in size than the first block size, and wherein the disk drive stores via emulation a plurality of emulated blocks of the first block size in each block of the second block size. The disk drive generates a read error, in response to reading a selected block of the second block size in which the at least block of the first block size is to be written via the emulation. The disk drive performs a destructive write of selected emulated blocks of the first block size that caused the read error to be generated. The disk drive writes the at least one block of the first block size in the selected block of the second block size. The disk drive sends a notification to indicate the performing of the destructive write.

Abstract: A method is used in managing read caching. First and second read caches are maintained in a data storage system. The first read cache is controlled by a first storage controller and the second read cache is controlled by a second storage controller. Read cache data is copied from the first storage controller to the second storage controller. A failure of the first storage controller is detected. Based on the detection, the copied read cache data is processed at the second storage controller to make the copied read cache data available for use at the second storage controller.

Abstract: A primary storage controller is maintained in a copy relationship with a secondary storage controller, wherein the primary and secondary storage controllers are coupled to a host that is configurable to use the secondary storage controller instead of the primary storage controller. The primary storage controller determines occurrence of at least one condition in the primary storage controller, wherein the at least one condition occurs prior to a failure of the host to perform an Input/Output (I/O) operation with respect to at least one storage volume of the primary storage controller. The primary storage controller communicates the occurrence of the at least one condition to the host, wherein in response to the communicating the host is configured to determine whether to use the secondary storage controller instead of the primary storage controller based on the occurrence of the at least one condition.

Abstract: The method includes receiving a command at a first storage system of a block storage cluster. The command is transmitted by the initiator system to the first storage system via a network and includes a request for data. The method further includes transferring the stored data from the first storage system to the initiator system via the network when data requested in the data request is stored by the first storage system. The method further includes transmitting a referral response from the first storage system to the initiator system when a portion of the data requested in the data request is not stored by the first storage system, but is stored by a second storage. system of the block storage cluster.

Abstract: Various embodiments for automated error recovery in a computing storage environment by a processor device are provided. In one embodiment, if a failure is caused by an operation of a hardware management console (HMC) and a malfunction of a current network connection, a cleanup operation is performed on at least a portion of a current HMC configuration, an alternative network connection to the current network connection is made, and a retry operation is performed.

Abstract: A controller of a storage control apparatus creates a fixed value, which is one or higher values conforming to a prescribed data pattern, with respect to first data, which is smaller than the size of a storage area of a storage device, creates a guarantee code related to a data area comprising the first data and the fixed value, and writes the data group comprising the data area and the guarantee code to the storage area. The controller reads a data group from the storage area, and determines whether or not more errors than the number of errors correctable by the guarantee code are included in this data group. In a case where the result of this determination is affirmative, the controller determines whether or not an error exists in the fixed value inside the data group.

Abstract: A mechanism is provided for controlling a solid state disk. A failure detector detects a failure in the solid state disk. Responsive to failure detector detecting a failure, a status degrader sets a degraded status indicator for the solid state disk. Responsive to the degraded status indicator, a degraded status controller maintains the solid state disk in operation in a degraded operation mode.

Abstract: A second controller is communicated with from a first controller via an interface. Storage is also communicated with from the first controller via the interface. The first controller is configured to be a master on the interface and the second controller and the storage are configured to be targets on the interface.

Abstract: A system and method for recovering from a configuration error are disclosed. A Basic Input Output System (BIOS) configures a memory associated with a node of an information handling system and enables a progress monitoring process during configuration of the memory. The memory is disabled if the BIOS determines that a configuration error occurred and a memory reference code associated with the memory is modified in order to prevent a reset of the information handling system.

Abstract: A data scrubbing apparatus corrects disturb errors occurring in a memory cell array, such as SMT MRAM cells. The data scrubbing apparatus activates scrubbing of the data and associated error correction bits based on a number of errors corrected, at a power up of the memory cell array, or a programmed time interval. The data scrubbing apparatus may generate an address describing the location of the memory cells to be scrubbed. The data scrubbing apparatus then commands the array of memory cells to write back the corrected data, the associated error correction bits, and reference bits. The data scrubbing apparatus provides a busy indicator externally during a write back of corrected data.

Abstract: Each cache line of a cache has a lockout state that indicates whether an error has been detected for data accessed at the cache line, and also has a data validity state, which indicates whether the data stored at the cache line is representative of the current value of data stored at a corresponding memory location. The lockout state of a cache line is indicated by a set of one or more lockout bits associate with the cache line. In response to a cache invalidation event, the state of the lockout indicators for each cache line can be maintained so that locked out cache lines remain in the locked out state even after a cache invalidation. This allows memory error management software executing at the data processing device to robustly manage the state of the lockout indicators.

Abstract: A mechanism is provided for controlling a solid state disk. A failure detector detects a failure in the solid state disk. Responsive to failure detector detecting a failure, a status degrader sets a degraded status indicator for the solid state disk. Responsive to the degraded status indicator, a degraded status controller maintains the solid state disk in operation in a degraded operation mode.

Abstract: The present invention discloses a method and device for reading a memory card comprising a primary partition and at least one backup partition. The method comprises the following steps that: after writing a first file into the primary partition of the memory card, a read/write device writes the first file into the at least one back partition; and when reading a second file from the memory card, the read/write device reads the second file from the at least one backup partition or from the primary partition if an error occurs in the reading of the second file from the backup partition. The method and device provided herein address the problems existing in the prior art that an embedded system is unstable because of the low error tolerance of a memory card.

Abstract: Described embodiments provide a media controller for processing a diagnostic request received from a diagnostic source. The received diagnostic request is parsed by a corresponding request handling module of the media controller, where each diagnostic source type has a corresponding request handling module. If the received diagnostic request requires allocation of buffer space, a common diagnostic handling module of the media controller allocates buffer space in a buffer for the received diagnostic request. The common diagnostic handling module is common for all diagnostic source types. The common diagnostic handling module provides the received diagnostic request to a corresponding one of a plurality of end diagnostic handling modules. The end diagnostic handling module performs the diagnostic tasks. If the received diagnostic request requires a transfer of data to the diagnostic source, the common diagnostic handling module performs the data transfer between the media controller and the diagnostic source.

Abstract: A storage system including: a controller; and, a plurality of physical storage devices coupled to the controller and constituting a RAID group; wherein the controller provides one or more logical volumes belonging to the RAID group, each of the one or more logical volumes having a plurality of storage areas; and one or more virtual volumes, wherein, when receiving a write request to a virtual volume of the one or more virtual volumes, the controller is configured to: allocate a storage area in a logical volume to the virtual volume, as an allocated storage area, where reliability of the storage area is used as a criterion in a selection of the storage area for allocation to the virtual volume; and write data to the allocated storage area, wherein, the controller is configured to selectively perform a RAID allocation process to a storage area allocated to a virtual volume.