Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 3 of 29

A-Z

  1. Term

    Brier score

    For a binary event, the Brier score is the mean squared difference between each forecast probability and its observed zero-or-one outcome.

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  2. Term

    Btrfs

    Btrfs is a Linux filesystem built around copy-on-write B-trees, with integrated snapshots, checksumming and multi-device storage.

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  3. Term

    Btrfs filesystem du

    A Btrfs command that uses FIEMAP to report extent usage and sharing for selected files and directory trees.

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  4. Term

    Btrfs NODATASUM

    Btrfs NODATASUM marks file data as excluded from the filesystem's data checksumming.

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  5. Term

    Btrfs read-only subvolume

    A Btrfs read-only subvolume is a subvolume whose ro property prevents modification of its file contents and directory hierarchy.

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  6. Term

    Btrfs received UUID

    A Btrfs received UUID is a subvolume metadata field recording the source subvolume identity associated with a received replication stream.

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  7. Term

    Btrfs send stream

    A Btrfs send stream is a versioned sequence of commands describing a subvolume or changes needed to reconstruct it from existing state.

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  8. Term

    Btrfs tree log

    The Btrfs tree log is a per-subvolume recovery structure that can persist file or directory changes for fsync without a full filesystem transaction commit.

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  9. Term

    Bubble memory

    Bubble memory is nonvolatile storage that represents bits by the presence or absence of movable cylindrical magnetic domains in a thin magnetic film.

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  10. Term

    Buffered I/O

    Buffered I/O is file access through an operating-system cache, allowing transfers between an application and storage to be decoupled.

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  11. Term

    Buffered upsert

    A buffered upsert encodes a deferred transformation of a key's value without first fetching that value.

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  12. Term

    Byte hit ratio

    Byte hit ratio is the fraction of requested payload bytes served from a cache under a stated request-accounting rule.

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  13. Term

    Byte-addressable storage

    Byte-addressable storage exposes individual byte locations rather than only block-sized addresses, without by itself specifying atomicity or durability.

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  14. Term

    Cache admission

    Cache admission is the decision to retain a fetched item in a cache or cache segment rather than bypass it.

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  15. Term

    Cache inclusion property

    The cache inclusion property requires the resident set at a smaller capacity to be contained in that at a larger capacity after each shared request prefix under the same replacement policy.

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  16. Term

    Cache pollution

    Cache pollution occurs when cached data displaces other data whose retention would provide greater benefit to the workload.

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  17. Term

    Cause-specific hazard

    A cause-specific hazard is the instantaneous rate of one event type among units still free of all modeled first events.

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  18. Term

    CD block error rate (BLER)

    CD BLER counts blocks containing detectable errors per second at the input to the C1 decoder.

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  19. Term

    CFexpress

    CFexpress is a removable memory-card standard of the CompactFlash Association that carries the NVMe protocol over PCIe, in three form factors (Type A, B and C with 1, 2 and 4 PCIe lanes), aimed at professional imaging and embedded recorders.

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  20. Term

    Chain replication

    Chain replication orders replicas so that updates enter at a head, propagate along the chain and complete at a tail that also serves queries.

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  21. Term

    Charge trap flash

    A flash cell design that stores charge in localized traps within an insulating material rather than on a conductive floating gate.

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  22. Term

    Checkpoint starvation

    Checkpoint starvation is sustained inability to finish or reset a database log checkpoint because the required progress conditions keep being obstructed.

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  23. Term

    Checksum

    A checksum is a value computed from specified data and later compared with a reference value to detect changes.

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  24. Term

    Chunk fragmentation

    Chunk fragmentation is the dispersion of chunks needed by a deduplicated restore across storage containers or an order poorly matched to the restore sequence.

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  25. Term

    CKD DASD

    Count-key-data (CKD) is the track format of classic mainframe direct access storage devices: each track holds records made of a count area (record identifier and lengths), an optional key area and a data area, separated by gaps, instead of the fixed-size sectors of SCSI-style disks.

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  26. Term

    Class prevalence

    Class prevalence is the proportion of observations belonging to a specified class in a defined population or evaluation sample.

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  27. Term

    Clear sanitization

    Clear sanitization uses logical operations across all user-addressable storage locations to resist simple, non-invasive recovery through the device interface available to the user, such as the host interface.

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  28. Term

    CLOCK cache replacement

    CLOCK is a cache replacement policy that gives referenced entries another chance by clearing their reference state during an eviction scan.

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  29. Term

    close

    close is an operation that releases a file descriptor so its number can be allocated again.

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  30. Term

    Close-to-open consistency

    Close-to-open consistency is a file-sharing cache policy that combines writeback at close with validation at a later open to support visibility of updates between sequential users.

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