Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 22 of 29

A-Z

  1. Term

    Retry deduplication

    Retry deduplication recognizes repeated submissions of one logical request so that an already completed mutation is not executed again.

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  2. Term

    Ribbon filter

    A static approximate-membership filter built using banded Boolean linear systems, offering a space and construction-cost tradeoff relative to Bloom filters.

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  3. Term

    Right-censoring

    Right-censoring records that a time-to-event exceeds the last observed event-free time without observing the event time itself.

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  4. Term

    Robotic tape loader

    A robotic tape loader is the mechanism in a tape library (the picker, or medium transport element in SCSI terms) that moves cartridges between storage slots, import/export slots and tape drives under host command.

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  5. Term

    RocksDB atomic flush

    RocksDB atomic flush installs the results of flushing selected column families into the database as one logical all-or-nothing MANIFEST group.

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  6. Term

    RocksDB BackupEngine

    RocksDB BackupEngine manages backup recovery points, their file metadata and restoration into a database directory.

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  7. Term

    RocksDB checkpoint

    A RocksDB checkpoint is a captured database directory that can be opened separately from the source database.

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  8. Term

    RocksDB column family

    A RocksDB column family is a separately configurable logical key space within one database, with its own memtables and SST files but a shared write-ahead log.

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  9. Term

    RocksDB MANIFEST

    RocksDB MANIFEST is the version-edit log mechanism used to recover the database's recorded state, with CURRENT identifying the active manifest log.

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  10. Term

    RocksDB pending compaction bytes

    RocksDB pending compaction bytes is an estimate of rewrite work needed to bring LSM levels within their size targets under level-based compaction.

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  11. Term

    RocksDB read snapshot

    A RocksDB read snapshot is a handle selecting a point-in-time read view within a running database.

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  12. Term

    RocksDB WAL tracking

    RocksDB WAL tracking records log metadata so recovery can detect missing or incomplete logs that checksums on surviving records alone cannot identify.

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  13. Term

    RocksDB write slowdown

    A RocksDB write slowdown is the rate-reduction state of write backpressure, distinct from a full write stop.

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  14. Term

    RocksDB write stall

    A RocksDB write stall is backpressure that delays or stops foreground writes when configured resource or background-work limits are reached.

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  15. Term

    RocksDB WriteBufferManager

    RocksDB WriteBufferManager is a shared controller that accounts for memtable memory across participating column families or database instances and can trigger flushing, optional write stalls and block-cache charges.

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  16. Term

    Rollback journal

    A rollback journal is an undo log that preserves original database content so an incomplete transaction can be reversed.

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  17. Term

    Rollback protection

    Rollback protection rejects protected state older than an enforced version or freshness boundary using trusted state that cannot be rolled back with the protected object.

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  18. Term

    Rolling hash

    A rolling hash updates a fingerprint incrementally as the input window or stream advances, instead of recomputing it over the entire input each time.

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  19. Term

    Rotational latency

    Rotational latency is the wait for a requested sector to pass under a hard-disk head after track positioning, with a half-revolution mean only under a uniform rotational-phase model.

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  20. Term

    Rotational media

    Rotational media is storage that keeps data on one or more spinning platters or discs, read and written by actuator-positioned heads, such as a hard disk drive or an optical disc, so access time depends on moving parts and on the angular position of the data.

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  21. Term

    Rotational vibration (RV)

    Rotational vibration is angular oscillatory motion that can disturb an HDD's ability to keep its heads aligned with recording tracks.

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  22. Term

    RPMB (Replay Protected Memory Block)

    RPMB is a dedicated storage area and authenticated access mechanism in eMMC and UFS that uses freshness checks to resist unauthorized modification and replay.

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  23. Term

    Run-length limited (RLL) encoding

    Run-length-limited (RLL) encoding is a modulation code for magnetic and optical recording that limits the run of 0s between successive 1s (flux transitions) to at least d and at most k, so that transitions are not too close for peak detection and not too far apart for clock recovery; in disk drives it was later replaced by codes designed for PRML detection.

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  24. Term

    RWF_ATOMIC

    RWF_ATOMIC is a Linux pwritev2 flag requesting torn-write protection for the data range of a supported direct-I/O write.

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  25. Term

    RWF_DONTCACHE

    RWF_DONTCACHE is a Linux per-operation flag requesting best-effort removal of page-cache content newly instantiated by a buffered read or write.

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  26. Term

    RWF_NOWAIT

    RWF_NOWAIT is a per-operation Linux I/O flag requesting that supported operations avoid waiting for unavailable data or contended resources.

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  27. Term

    S.M.A.R.T.

    Self-Monitoring, Analysis and Reporting Technology exposes drive health metrics to the host.

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  28. Term

    Sampling design

    A sampling design specifies the possible samples from a population and the probability with which each sample is selected.

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  29. Term

    SAN

    A storage area network (SAN) is a storage network that gives multiple servers (initiators) block-level access to shared storage devices (targets) over a fabric such as Fibre Channel, iSCSI on TCP/IP or NVMe over Fabrics.

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  30. Term

    Sanitization validation

    Sanitization validation decides whether to accept or reject a sanitization result after evaluating its evidence, suitability and remaining risk to data confidentiality.

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