Abstract: A plurality of files are stored on magnetic tape having at least one wrap for storing data sets. Each data set includes one or more records. A number of data sets that will remain in a buffer memory after performing a read ahead operation is determined. A number of records that are likely to remain in the buffer memory after performing a read ahead operation is determined. For each record likely to remain in the buffer memory after performing a read ahead operation, positions of the records on the magnetic tape are determined. Each file of the plurality of files are classified into one group of a plurality of groups based on a position of a record corresponding with each respective file and the number of records that are likely to remain in the buffer memory after performing a read ahead operation.

Abstract: Aspects of the present disclosure relate to a method for reducing repositioning time within tape systems. A request to reposition to a target file within a tape medium can be received. A determination can be made that a previous command issued to the tape system was a write and that an index corresponding to the write has not been written. In response to determining that the previous command was the write and that the index corresponding to the write has not been written, a first file mark, the index after the first file mark, and a second file mark after the index can be written.

Abstract: A computer-implemented method for altering a position on a tape at which the tape transitions to a DATA_FULL state is disclosed. The computer-implemented method further includes determining, after a file is written to a Data Partition of the tape, a size of an Index representing metadata associated with the file. The computer-implemented method further includes altering, based on the size of the Index representing metadata associated with the file, a position in the Data Partition of the tape at which the tape transitions to the DATA_FULL state.

Abstract: A method includes, for files in a storage system requested in sequence by an application, identifying a pre-file and identifying a post-file requested after the pre-file. The method also includes incrementing a pre-read count for the pre-file in file attributes associated with the pre-file and incrementing a post-read count for the post-file in file attributes associated with the post-file. The method includes selecting a position in a save list for each file based on the pre-read and post-read counts and saving the files on tape media according to the relative positions of the files in the save list. A computer program product includes one or more computer readable storage media and program instructions collectively stored on the one or more computer readable storage media. The program instructions includes program instructions to perform foregoing method. A system includes a processor and logic configured to perform the foregoing method.

Abstract: A computer-implemented method according to one approach includes copying data stored on a Linear Tape File System (LTFS)-based storage system to blocks of a Random Access Nonvolatile Memory (RANVM) drive. The data is copied in units of the blocks of the drive. The method further includes constructing file metadata so that the copied data on the drive is accessible as one or more files. A computer program product according to another approach includes a computer readable storage medium having program instructions embodied therewith. The program instructions are readable and/or executable by a controller to cause the controller to perform the foregoing method. A system according to another approach includes a processor, and logic integrated with the processor, executable by the processor, or integrated with and executable by the processor. The logic is configured to perform the foregoing method.

Abstract: Disclosed is an additive for nonaqueous electrolyte solutions, including a first compound represented by the formula (1), and at least one second compound selected from the group consisting of an ethylene carbonate compound, a vinyl ethylene carbonate compound, a cyclic sulfonic acid ester compound, and a cyclic disulfonic acid ester compound, in the formula (1), X represents a sulfonyl group or a carbonyl group, and R1 represents an alkyl group having 1 to 4 carbon atoms and optionally substituted with a halogen atom or the like.

Abstract: A multilayer ultrasonic transducer of an embodiment includes: a plurality of stacked oscillators; external electrodes disposed on outer exposed surfaces of two oscillators disposed in the outermost layers out of the plurality of oscillators; and a plurality of internal electrodes each disposed between two of the plurality of oscillators. There are provided electrode regions in which the plurality of internal electrodes are arranged such that the number of layers of the internal electrodes in a direction in which the oscillators are stacked gradiently increases from an inner region toward an outer peripheral region of the plurality of oscillators, and ultrasonic waves emitted from the plurality of oscillators are focused toward at least the inner region.

Abstract: A computer-implemented method, according to one embodiment, includes: estimating, by the computer system, a waiting time for copy target data to be transferred from the source medium. The waiting time includes an estimated time for locating and reading the copy target data from the source medium. The method also includes selecting, by the computer system, migration target data on the source medium based on whether migration of data to the target medium is expected to be finished within the waiting time. The selecting is based at least in part on comparing a size of the data and an allowable size calculated based on the waiting time and an estimated write transfer rate to the target medium. The method further includes migrating, by the computer system, the migration target data from the source medium to the target medium.

Abstract: An approach for improving the tape storage media by optimizing tape drives in a tape library. Embodiments manage, by a web interface provided by a tape library, an inventory of one or more tape drives and the one or more tape media in the tape library, and record high tension discharge and distance measurement after formatting in a cartridge memory of the one or more tape media in the tape library. Further, embodiments manage the high tension discharge and the distance measurement after formatting in the cartridge memory of the one or more tape media by measuring a distance between servo bands utilizing one or more unused tape drives and one or more low frequency tape drives in the tape library, and execute a rewind at low tension using the one or more unused tape drive and the one or more low frequency tape drives.

Abstract: Embodiments are disclosed for a method. The method includes generating a file list of an original source tape. The file list identifies files that are stored on the original source tape. The method further includes determining a number of possible parallel copies for a data storage system having multiple tape drives. The method additionally includes generating multiple tape file lists. Each of the tape file lists identify copies of the files stored on one of multiple source tapes. Further, the method includes generating multiple new copies of the files by copying, in parallel, a subset of the files, and a subset of the copies, based on the tape files lists, and using a first of the tape drives, and a second of the tape drives.

Abstract: According to one embodiment, an inspection device includes a transmitter, a receiver, and a supporter. The transmitter is configured to transmit a first ultrasonic wave including burst waves having a first period Tp. The receiver on which the first ultrasonic wave is incident is configured to output a signal corresponding to the incident first ultrasonic wave. The supporter is provided between the transmitter and the receiver. The supporter is configured to support an inspection object. The first period Tp (s), a distance Dx (m), and a velocity vx (m/s) satisfy 2Dx/((n+1)·vx)<Tp<2Dx/(n·vx). n is 1 or 2. The distance Dx is a shorter distance of first and second distances. The first distance is a distance along a first direction between the transmitter and the supporter. The second distance is a distance along the first direction between the supporter and the receiver.

Abstract: A method, executed by at least one processor, includes generating a snapshot for a plurality of data files, receiving an update request for a selected file of the plurality of data files, determining if the selected file is subject to a backup policy, updating the selected file without preserving the snapshot of the selected file if the selected file is not subject to the backup policy, and updating the selected file while preserving the snapshot of the selected file if the selected file is subject to the backup policy. A corresponding computer program product and computer system are also disclosed herein.

Abstract: A computer-implemented method for performing a storage reclaim on a storage device includes generating a second tape image on a first storage device. The computer-implemented method further includes copying metadata associated with a first data extent of a valid file from a first index partition of a first tape image to a second index partition of the second tape image. The computer-implemented method further includes copying file data associated with the first data extent from a first data partition of the first tape image to a second data partition of the second tape image. The computer-implemented method further includes adjusting metadata associated with the file data of the first data extent copied to the second data partition of the second tape image. The computer-implemented method further includes releasing a storage area corresponding to the first data extent of the valid file included in the first tape image.

Abstract: A method for indexing a tape for unmounting from a tape drive is discussed. The method can determine that an update has been made to the tape since it was last mounted. The method can identify a tape head position with respect to the tape, the tape including a data partition and an index partition. The method can identify first position and a second position on the tape. The method can determine first distance, a length of tape between first position and tape head position. The method can determine second distance, a length of tape between first position and second position. The method can determine that first distance is less than second distance. The method can reposition the tape to a primary section and write the metadata index. The method can reposition tape to the second position write a data index beginning at the second position of the data partition.

Abstract: A linear tape file system (LTFS) maintains a series of indexes, and an incremental change dataset, that records incremental changes that have taken place in each new index over the previous one, as each new index of the series is created. Upon receiving a command to roll back the file system from a current generation to a target previous generation, a generation control module applies information in the incremental change dataset to the current index. In this way, the current index is restored, at least functionally, to the state it was in when the target generation was created, thereby effectuating the rollback of the file system to the target generation.

Abstract: Provided is a method for writing and deleting files on a tape medium and a cache storage device. The method includes receiving a command to write one or more files of a directory to a tape medium. The method further includes identifying a cache limit associated with the tape medium. The method further comprises determining whether the amount of data of the directory that is already on the cache storage device exceeds the cache limit. In response to the amount of data not exceeding the cache limit, the method includes writing data of the one or more files to the cache storage device and the tape medium in parallel.

Abstract: A computer-implemented method for indexing a tape for unmounting from a tape drive. The computer-implemented method includes: receiving a request to unmount the tape from the tape drive, wherein the tape includes an index partition and a data partition, determining that an update to the tape is not reflected in any data index written in the data partition, appending a new data index at the end of the last written data file in the data partition, wherein the new data index includes information associated with the update to the tape, unthreading the tape from the tape drive, wherein unthreading the tape from the tape drive is performed at low tension writing a metadata index to an ancillary storage device, wherein the metadata index includes information associated with the update to the tape.

Abstract: Deep learning applications access modified files stored in high speed storage. The modified files are custom formatted for use by deep learning applications to minimize file size. Parent files from which the modified files are made are stored in low speed storage as files having the original characteristics of the parent files. Requesters identified as deep learning applications are provided access to the modified files in high speed storage. Requesting applications not identified as deep learning applications receive the parent files via conventional processing from low speed storage.

Abstract: A method includes setting a maximum total size of data saved in a snapshot area, creating a snapshot of a file system, including reference to a plurality of logical volumes, saving at least a part of the plurality of logical volumes in the snapshot area on condition that it does not exceed the maximum total size of data saved in the snapshot area, and executing copy-on-write processing in response to a writing request for data in the file system, the data not being saved in the snapshot area.

Abstract: Described are techniques for a tape unmounting protocol. The techniques include selecting a tape for unmounting from a plurality of tape drives, where the tape for unmounting includes a remaining capacity below a first threshold and a number of migrated files below a second threshold. The techniques further include unmounting the tape for unmounting from a tape drive.