Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 13 of 29

A-Z

  1. Term

    Logical journaling

    Logical journaling records recoverable changes to logical objects or operations rather than simply reproducing their on-disk representation.

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  2. Term

    Logical sector

    A logical sector is the addressable data unit selected by a logical block address at a storage interface.

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  3. Term

    Logical unit (LUN)

    A logical unit (LU) is an addressable I/O device inside a SCSI target, such as a volume presented by a storage array, and its address within that target is the logical unit number (LUN), a 64-bit field in the iSCSI header.

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  4. Term

    Longitudinal magnetic recording

    Magnetic recording where bit magnetization lies in the plane of the disk, largely replaced by PMR for capacity.

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  5. Term

    Lost write

    A lost write is a write reported as completed whose intended update is absent at the required storage location.

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  6. Term

    LSM compaction

    LSM compaction reorganizes sorted storage components, commonly merging selected runs or SST files and removing obsolete entries when visibility rules permit.

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  7. Term

    LSM tombstone

    An LSM tombstone is a versioned deletion marker that suppresses older values for a key without immediately erasing their stored bytes.

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  8. Term

    LTFS

    Linear Tape File System is a self-describing tape format that stores files and directory metadata for interchange between compatible implementations.

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  9. Term

    LTFS data placement policy

    An LTFS data placement policy specifies which file data may be stored in the index partition alongside filesystem metadata.

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  10. Term

    LTFS index

    An LTFS index is XML metadata describing files, directories and the mapping from file contents to recorded tape extents.

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  11. Term

    LTO (Linear Tape-Open)

    An open tape format standard for high-capacity cartridges, advanced by the LTO Program for backup and archive.

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  12. Term

    LUKS

    LUKS is a disk-encryption format that records cryptographic parameters and key-management metadata, including keyslots used to unlock encrypted storage.

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  13. Term

    LVM

    The Linux volume-management system that groups physical volumes into volume groups and exposes logical volumes through device-mapper.

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  14. Term

    LZ4 frame

    An LZ4 frame wraps data blocks in a descriptor and end marker, with optional length, dictionary identification and integrity checks.

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  15. Term

    M-DISC

    M-DISC is a family of write-once optical media marketed for archival storage using an inorganic recording layer.

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  16. Term

    M.2

    M.2 is a compact module form-factor family used for storage and other devices, with SSD compatibility determined by physical fit, host interface and software support.

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  17. Term

    Magnetic anisotropy

    Magnetic anisotropy is the dependence of magnetic energy or response on the direction of magnetization.

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  18. Term

    Magnetic recording trilemma

    The magnetic recording trilemma is the coupled constraint of signal-to-noise ratio, thermal stability and writability as recording density increases.

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  19. Term

    Magnetic tape storage

    Sequential storage on linear magnetic tape in removable cartridges, used mainly for backup and cold archive.

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  20. Term

    Magnetic thermal stability factor

    The magnetic thermal stability factor is the ratio of a magnetization-reversal energy barrier to thermal energy at a specified absolute temperature.

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  21. Term

    Magneto-optical disc

    Optical-magnetic media written with a laser and magnetic field, used for archival and removable storage.

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  22. Term

    Mainframe DASD

    Mainframe DASD (direct-access storage device) is the disk storage attached to mainframe systems through channel programs, historically organised as count-key-data tracks addressed by cylinder, head and record, with fixed-block volumes as a second format.

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  23. Term

    Major-minor loop architecture

    Major-minor loop architecture organizes bubble memory into smaller storage loops connected by transfer elements to shared read and write access paths.

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  24. Term

    MAP_SYNC

    MAP_SYNC is a Linux mmap flag for supported DAX files that provides a file-offset persistence guarantee used with appropriate CPU persistence instructions.

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  25. Term

    Massive array of idle disks

    A massive array of idle disks is a storage architecture that keeps selected disks spun down between accesses to reduce energy use.

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  26. Term

    Matthews correlation coefficient

    For binary classification, the Matthews correlation coefficient is the Pearson correlation between predicted class labels and observed outcomes, calculated from all four confusion-matrix counts.

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  27. Term

    Maximum distance separable code

    A maximum distance separable code achieves minimum distance n - k + 1 for length n and dimension k, allowing recovery from any n - k known symbol erasures.

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  28. Term

    Mean time to data loss (MTTDL)

    Mean time to data loss (MTTDL) is the expected time until a storage system first loses data that cannot be retrieved or reconstructed.

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  29. Term

    Mean time to detection

    Mean time to detection is the arithmetic mean of elapsed times between event occurrence and detection for a specified event population.

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  30. Term

    Medium Auxiliary Memory

    Medium Auxiliary Memory is nonvolatile storage associated with an individual storage medium, used to hold auxiliary attributes about the medium and its recorded data.

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