Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 5 of 29

A-Z

  1. Term

    Cryptographic hash function

    A cryptographic hash function deterministically produces a digest and is designed to resist preimage, second-preimage and collision attacks.

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  2. Term

    Cryptographic nonce

    A cryptographic nonce is an input value whose required uniqueness scope is specified by the cryptographic construction that uses it.

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  3. Term

    Cuckoo filter

    A cuckoo filter is an approximate-membership structure that stores short fingerprints in candidate buckets and supports insertion, lookup and deletion subject to its update contract.

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  4. Term

    Cumulative incidence function

    A cumulative incidence function gives the probability that a specified event type occurs by a given time before any competing event.

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  5. Term

    Curie-temperature distribution

    Curie-temperature distribution is the spread of ferromagnetic transition temperatures across the grains of a recording medium.

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  6. Term

    CXL memory expansion

    Compute Express Link attaches byte-addressable memory or accelerators on PCIe, blurring DRAM and storage tiers.

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  7. Term

    DAT cartridge

    A DAT cartridge is a 3.81 mm wide magnetic tape cassette recorded by helical scan in the DDS (Digital Data Storage) format, standardised by ECMA from 1990 and later adopted by ISO/IEC, which grew from 60 m and 90 m tapes to 125 m tapes holding 12 GB uncompressed in the DDS-3 generation.

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  8. Term

    Data deduplication

    Data deduplication replaces duplicate content with references to shared stored blocks or chunks within a defined matching scope.

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  9. Term

    Data sanitization

    Media sanitization is a process that makes recovery of target data infeasible for a specified level of effort.

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  10. Term

    Data scrubbing

    Data scrubbing is proactive verification of stored data to discover errors before ordinary access requires the affected content.

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  11. Term

    Database checkpoint

    A database checkpoint records engine-defined recovery state to bound or reduce the work needed after a crash.

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  12. Term

    Database write amplification

    Database byte write amplification is storage-engine output bytes written divided by logical input bytes over a stated interval and accounting boundary.

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  13. Term

    ddrescue mapfile

    A ddrescue mapfile records input byte ranges and their rescue states so copying can resume without rereading ranges marked finished.

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  14. Term

    Deallocated read behavior

    The interface-defined data or error returned when a host reads a deallocated logical block.

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  15. Term

    Deduplication side channel

    A deduplication side channel leaks information about stored content through observable behavior caused by duplicate detection.

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  16. Term

    Degaussing

    Degaussing uses a strong reverse magnetic field matched to the medium's coercivity to disrupt recorded magnetization, and can sanitize suitable magnetic media such as tape and hard disk platters but not flash.

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  17. Term

    Degraded array

    A degraded array is a redundant storage array operating with less than its configured healthy redundancy because one or more members are unavailable or not fully synchronized.

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  18. Term

    Delayed allocation

    A filesystem allocation strategy that defers choosing physical storage locations for data already accepted into its buffered write path.

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  19. Term

    Delete marker

    A delete marker is a payload-free S3 version that makes a key appear deleted when the marker is current.

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  20. Term

    Delete persistence latency

    In delete-aware LSM research, delete persistence latency is the delay from inserting a tombstone to removing the entries it invalidates through compaction.

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  21. Term

    Destroy sanitization

    Destroy sanitization makes target-data recovery infeasible even with current state-of-the-art laboratory techniques and leaves the medium incapable of storing data again.

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  22. Term

    Device-managed SMR (DM-SMR)

    An SMR HDD that presents a conventional LBA interface while the firmware relocates writes across shingled bands.

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  23. Term

    Differential backup

    A differential backup captures changes accumulated since its designated full-backup base, rather than only changes since the preceding differential backup.

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  24. Term

    Differential observability

    Differential observability is a difference between entities' observations of the same system's health.

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  25. Term

    Direct Access

    Direct Access is a Linux mechanism that lets suitable memory-like storage serve file data without an intervening page-cache copy.

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  26. Term

    Direct I/O

    Direct I/O is a file-access mode, such as Linux O_DIRECT, that requests I/O through user-space buffers while minimizing use of the local operating-system page cache.

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  27. Term

    Direct-I/O alignment

    Direct-I/O alignment is the per-file constraint on memory addresses, file offsets and I/O segment lengths used for direct transfers.

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  28. Term

    Directory fsync

    Directory fsync is synchronization of a directory descriptor to persist directory state, including changes to the names through which files are reached.

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  29. Term

    Discard

    A block-storage request indicating that specified logical ranges are no longer needed by the caller.

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  30. Term

    Disk defect skipping

    Disk defect skipping formats a record around a known defective medium region so that normal reads bypass a gap instead of storing customer data there.

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