Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 24 of 29

A-Z

  1. Term

    Short write

    A short write is a successful write operation that reports transferring a positive number of bytes smaller than the requested count.

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  2. Term

    SIEVE cache eviction

    SIEVE is a cache replacement policy that retains insertion order and uses a visited bit and a moving pointer to select an unvisited eviction victim.

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  3. Term

    Single-level cell (SLC)

    NAND storage of one bit per cell using two distinguishable threshold-voltage states.

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  4. Term

    Skippable frame (Zstandard)

    A Zstandard skippable frame carries length-delimited user metadata that the standard decompression path skips.

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  5. Term

    SLC cache

    A NAND region operated in one-bit mode as a write cache for denser NAND storage, with still-valid data eligible for later migration.

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  6. Term

    SLC SSD

    An SLC SSD is a solid-state drive whose NAND flash stores one bit per cell, using only two threshold-voltage states separated by one wide guard band, which gives the highest endurance and the lowest program latency of the cell types at the cost of the least capacity per cell.

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  7. Term

    Sloppy quorum

    A sloppy quorum allows reachable fallback nodes outside a key's normal replica set to participate when intended replicas are unavailable.

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  8. Term

    Slowdown ratio

    In Perseus, the slowdown ratio is observed drive latency divided by the workload-dependent upper prediction bound for that latency.

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  9. Term

    SMART normalized value

    A SMART normalized value is an ATA drive firmware's vendor-specific score for an attribute, interpreted against that attribute's threshold.

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  10. Term

    SMART raw value

    A SMART raw value is the vendor-defined attribute payload reported by an ATA drive, distinct from its normalized score.

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  11. Term

    smartctl exit status

    The smartctl exit status is a process result whose normal ATA interpretation combines independent command, health-threshold and log-history flags in an eight-bit mask.

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  12. Term

    SMB byte-range lock

    An SMB byte-range lock coordinates access to a specified region of a file through shared or exclusive locking associated with a file open.

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  13. Term

    SMB durable handle

    An SMB durable handle allows a client to attempt to recover an existing file open after a network disconnect.

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  14. Term

    SMB file sharing

    Server Message Block is a network protocol family used to access shared files and other server resources.

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  15. Term

    SMB FLUSH

    SMB FLUSH is an SMB2/SMB3 request to propagate cached information for an open file to its backing persistent store, or to wait for a named-pipe reader to consume previously written data.

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  16. Term

    SMB lease

    An SMB lease is a server-granted arrangement that permits selected client-side read, write, or handle caching while coordinating access to a shared object.

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  17. Term

    SMB opportunistic lock

    An SMB opportunistic lock is a revocable server-granted caching arrangement that lets a client reduce network operations while coordinating access to a file.

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  18. Term

    SMB persistent handle

    An SMB persistent handle extends durable-open recovery to server failover on a supporting continuously available share.

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  19. Term

    SMOTE

    SMOTE is an oversampling method that creates synthetic minority-class feature vectors by interpolating between a minority example and selected minority-class nearest neighbors.

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  20. Term

    SMR garbage collection

    SMR garbage collection relocates staged updates and rewrites affected shingled regions to reclaim reusable space.

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  21. Term

    SMR persistent cache

    An SMR persistent cache is a nonvolatile staging area that holds updates before they are incorporated into their target shingled regions.

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  22. Term

    Snapshot isolation

    Snapshot isolation gives a transaction a stable committed snapshot plus its own writes and prevents concurrent transactions that write the same data from both committing.

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  23. Term

    Snapshot-consistent flash translation layer

    A research FTL that recovers a flush-defined disk snapshot instead of an arbitrary later write prefix.

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  24. Term

    SNIA

    SNIA (Storage Networking Industry Association) is a not-for-profit industry association that publishes storage and data-infrastructure specifications, technical positions and educational material, including the Emerald power-efficiency measurement specification that a government energy-labelling programme uses as its test method.

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  25. Term

    Soft updates

    Soft updates is a filesystem metadata-consistency mechanism that delays unsafe on-disk changes until their update dependencies are satisfied.

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  26. Term

    Soft-decision decoding

    Soft-decision decoding uses reliability information about observed symbols rather than only their hard symbol decisions.

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  27. Term

    Solid-state drive (SSD)

    A solid-state drive is a storage device that retains data in nonvolatile semiconductor memory without moving recording media.

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  28. Term

    Solid-state media

    Solid-state media is persistent storage built from semiconductor memory cells, today mainly NAND flash and, experimentally, emerging memories such as phase-change memory, rather than from spinning disks or moving tape.

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  29. Term

    Sorted string table

    An immutable table of sorted key-value entries used as a persistent component in storage engines such as LevelDB and RocksDB.

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  30. Term

    Space amplification

    Database space amplification quantifies storage overhead relative to logical data size under an explicitly stated total-space or excess-space convention.

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