Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 7 of 29

A-Z

  1. Term

    Erasure coding

    Erasure coding encodes data with redundancy so that missing fragments at known locations can be reconstructed from a sufficient, code-dependent set of surviving fragments.

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  2. Term

    Error recovery control

    Error recovery control configures read and write recovery time limits for applicable ATA commands.

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  3. Term

    Error-and-erasure decoding

    Error-and-erasure decoding reconstructs a codeword while accounting for both known erased positions and incorrect values at unknown positions.

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  4. Term

    Error-correcting code

    An error-correcting code adds structured redundancy to data so a decoder can detect and correct specified error patterns.

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  5. Term

    errseq_t

    errseq_t is a Linux kernel datatype that records an error and sequence state so observers can detect failures since their saved cursor.

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  6. Term

    ESCON

    ESCON (Enterprise Systems Connection) is IBM's fiber-optic, half-duplex serial channel architecture for mainframes, built to replace the copper bus-and-tag parallel channel and later superseded by FICON.

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  7. Term

    ESDI

    ESDI (Enhanced Small Device Interface, standardised as X3.170-90) is a disk-drive interface in which one controller drives up to seven devices over a daisy-chained control cable that carries serial commands and status, plus a separate radial data cable per drive carrying NRZ data and clocks; the standard text covers 0 to 24 Mbit/s and both magnetic and optical disks.

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  8. Term

    Execute-in-place

    Execution of program instructions from their non-volatile storage location without first copying the executable code into a separate RAM image.

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  9. Term

    Expected calibration error

    Expected calibration error is a summary of disagreement between predicted probabilities and conditional outcome frequencies, commonly estimated by bin-weighted gaps on an evaluation sample.

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  10. Term

    Ext4 fast commit

    Ext4 fast commit is a journaling mechanism that records metadata deltas for eligible updates instead of a full traditional metadata-block commit.

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  11. Term

    Ext4 orphan file

    An ext4 orphan file is an internal metadata file that stores inode-number slots for orphan cleanup when the orphan_file filesystem feature is enabled.

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  12. Term

    Ext4 orphan inode

    An ext4 orphan inode is an inode tracked so recovery can finish deletion or remove excess allocations left by an interrupted truncation or extension.

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  13. Term

    Extended Asynchronous DRAM Refresh

    Extended Asynchronous DRAM Refresh is a platform capability that extends persistent-memory power-fail protection to CPU caches.

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  14. Term

    F1 score

    F1 score is the harmonic mean of precision and recall for a specified positive class and decision threshold.

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  15. Term

    F2FS

    F2FS is a Linux log-structured filesystem designed for flash storage devices that expose a block interface.

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  16. Term

    F2FS checkpoint

    An F2FS checkpoint records a consistent filesystem recovery point, including information selecting valid metadata-table versions.

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  17. Term

    F2FS roll-forward recovery

    F2FS roll-forward recovery reconstructs selected post-checkpoint file updates from recovery-marked node blocks.

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  18. Term

    Fail-slow

    Fail-slow describes a component that remains operational but performs more slowly than expected for its operating conditions.

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  19. Term

    Failure burst

    Under an adjacent-gap rule, a failure burst is a maximal sequence of event starts in which every consecutive gap is no greater than a specified window.

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  20. Term

    Failure detector

    A failure detector is a component that uses observations to report whether another process or endpoint is suspected of being unavailable.

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  21. Term

    Failure domain

    A failure domain is a group of components that can be affected by the same failure event because they share a dependency or physical location.

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  22. Term

    Failure label

    A failure label is a recorded outcome assigned to an observation under an explicit rule defining which event counts as failure and when it occurs.

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  23. Term

    Failure operation ticket

    A failure operation ticket is a management-system record of a detected hardware problem and its handling status, rather than necessarily a unique failed component.

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  24. Term

    False positive rate

    The false positive rate is the fraction of observed negative cases incorrectly classified as positive at a specified decision threshold.

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  25. Term

    FastCDC

    FastCDC is a content-defined chunking approach that combines Gear-based boundary selection, sub-minimum skipping and chunk-size normalization.

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  26. Term

    FastMap

    FastMap is a research redesign of Linux's memory-mapped I/O path that targets synchronization bottlenecks in multicore storage workloads.

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  27. Term

    Fault injection

    Fault injection is a testing method that deliberately introduces specified faults into a system to observe detection, propagation and recovery under a defined workload.

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  28. Term

    Fault model

    A fault model specifies the failures a test or analysis admits, their scope and timing, and which system state and components remain available afterward.

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  29. Term

    FCoE

    Fibre Channel over Ethernet tunnels FC frames on lossless Ethernet for converged data center networks.

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  30. Term

    fdatasync

    fdatasync is a file-synchronization operation that persists modified data and the metadata required to retrieve it, without requiring synchronization of all other file metadata.

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