Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 9 of 29

A-Z

  1. Term

    FTL translation page

    An FTL translation page is a flash page containing address-mapping entries.

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  2. Term

    Full backup

    A full backup captures every data object within a defined backup scope, whether or not it has changed since an earlier backup.

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  3. Term

    Full-object checksum

    A full-object checksum is an integrity value computed for an object's complete ordered byte sequence rather than for a list of its part checksums.

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  4. Term

    Full-page write

    A PostgreSQL full-page write records a recoverable page image in WAL to support recovery from an incomplete data-page write.

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  5. Term

    Full-stripe write

    A parity-array write supplying replacement data for every data position of a stripe so its new parity can be computed without reading the prior stripe contents.

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  6. Term

    Fuzzy checkpoint

    A fuzzy checkpoint records recovery information while transaction processing continues, rather than freezing all activity into one instantaneous database image.

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  7. Term

    Garbage collection (flash)

    Flash garbage collection reclaims a victim erase block by first preserving its valid data elsewhere and then erasing the block for reuse.

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  8. Term

    Ghost cache entry

    A ghost cache entry records the identity or history of an evicted item without retaining its cached payload.

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  9. Term

    Glass platter substrate

    A glass platter substrate is a disk blank made of chemically strengthened glass or glass-ceramic instead of nickel-phosphorus-plated aluminium alloy; it is stiff, hard, polishes to a very smooth surface and expands far less with temperature, but it is brittle, a poor heat conductor and electrically insulating, which brings its own processing problems.

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  10. Term

    Glass storage

    Glass data storage records information as laser-written structures inside transparent glass and reads their optical response to recover the encoded data.

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  11. Term

    Global Translation Directory (DFTL)

    The Global Translation Directory in DFTL maps translation-page identifiers to their current physical flash locations.

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  12. Term

    GMR read head

    A GMR read head is a hard-disk read element that uses giant magnetoresistance in a stack of thin magnetic and non-magnetic layers to turn very weak magnetic changes from the disk into large changes in electrical resistance; the first GMR read head was launched in 1997 and enabled the areal density gains of the late 1990s.

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  13. Term

    Gray failure

    A gray failure occurs when an application observes a system as unhealthy while that system's failure observer regards it as healthy.

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  14. Term

    Greedy garbage collection

    A flash block-cleaning policy that selects a candidate erase block with the fewest valid pages, minimizing the valid data copied for that selection.

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  15. Term

    Group commit

    Group commit is a logging optimization that shares a durable log synchronization across multiple concurrent transaction or write requests.

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  16. Term

    Grouped cross-validation

    Grouped cross-validation evaluates a predictor using splits that keep all observations from each specified group together in either training or testing within a split.

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  17. Term

    Gzip

    Gzip is a lossless compressed-file format whose file consists of a sequence of members, each carrying a compressed data stream and a trailer with CRC32 and uncompressed size modulo 2^32.

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  18. Term

    HAMR thermal gradient

    A HAMR thermal gradient is the spatial rate of temperature change in the recording medium along a specified direction.

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  19. Term

    Hard disk drive (HDD)

    A non-volatile storage device that records data on spinning platters with a moving read/write head.

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  20. Term

    Hard link

    A hard link is a directory entry naming an existing file's inode, so multiple hard links refer to the same file rather than to separate copies.

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  21. Term

    Hash collision

    A hash collision occurs when two distinct inputs produce the same digest under the same hash function and parameters.

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  22. Term

    Hash domain separation

    Hash domain separation encodes an input's role or context so distinct uses of a hash function do not share the same input representation.

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  23. Term

    Hazard rate

    The hazard rate is the instantaneous event rate at a given time conditional on the event not having occurred before that time.

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  24. Term

    HDD head gas bearing

    An HDD head gas bearing is the thin moving gas film whose pressure supports the head-carrying slider against its suspension load.

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  25. Term

    HDF5

    HDF5 is a data model, storage format and software library for organizing typed datasets, groups and associated metadata.

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  26. Term

    HDF5 chunked layout

    An HDF5 chunked layout divides a dataset into fixed-shape array blocks that can be stored and filtered separately.

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  27. Term

    HDF5 fill value

    An HDF5 fill value is the configured or default value supplied for dataset elements that lack stored or available mapped data.

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  28. Term

    HDF5 hyperslab

    An HDF5 hyperslab is a selection of elements in a multidimensional dataspace expressed through rectangular blocks and their positions.

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  29. Term

    HDF5 raw-data chunk cache

    The HDF5 raw-data chunk cache retains decoded dataset chunks in memory subject to byte capacity, hash-slot collisions and eviction policy.

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  30. Term

    HDF5 SWMR

    HDF5 SWMR is an access mode that permits one writer and multiple readers to use an HDF5 file with ordered metadata flushing under the required filesystem semantics.

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