Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 15 of 29

A-Z

  1. Term

    NAND page pairing

    NAND page pairing is the grouping of pages whose bits occupy the same physical memory cells.

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  2. Term

    NAND program interference

    NAND program interference is an unintended shift in a cell's threshold voltage caused by programming neighboring cells.

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  3. Term

    NAND read-reference voltage

    A NAND read-reference voltage is a sensing voltage used to distinguish stored cell states during a read operation.

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  4. Term

    NAND read-retry

    NAND read-retry rereads a flash page with adjusted sensing settings after an unsuccessful error-correction attempt.

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  5. Term

    NAND self-recovery

    NAND self-recovery is the partial relaxation of cycling-induced cell degradation during time between stress events.

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  6. Term

    NAND spare area

    The additional region associated with a NAND page, used for error-correction information, bad-block markers and other metadata according to a device- and controller-specific layout.

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  7. Term

    NAND thermal annealing

    NAND thermal annealing is a controlled heat treatment studied for partially reversing cycling-induced degradation in flash-memory cells.

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  8. Term

    NAND wordline

    A NAND wordline is a shared control-gate connection used to address a group of flash memory cells.

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  9. Term

    NAS

    Network-attached storage (NAS) is a storage device or server that connects to an IP network and gives clients file-level access to a file system it manages, using file-sharing protocols such as NFS or SMB, rather than attaching to a host as block devices.

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  10. Term

    Native Command Queuing

    Native Command Queuing (NCQ) allows multiple tagged ATA commands to be outstanding so a supporting device can schedule their execution.

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  11. Term

    Near-field transducer (NFT)

    A near-field transducer is a nanoscale optical structure that couples supplied light into a confined near field, used in HAMR to heat the recording medium.

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  12. Term

    Nearline HDD

    A nearline HDD is a vendor category of capacity-oriented enterprise hard disk drives commonly used for bulk online storage, distinct from nearline as a storage-availability class.

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  13. Term

    Nearline SAS

    Nearline SAS (NL-SAS) is a vendor class of high-capacity, typically 7,200-rpm 3.5-inch hard drives that use the SAS interface and SCSI command set, intended for always-on bulk capacity tiers rather than latency-sensitive primary storage.

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  14. Term

    Neel-Arrhenius model

    The Neel-Arrhenius model describes thermally activated magnetic reversal with an exponential dependence on the ratio of an energy barrier to thermal energy.

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  15. Term

    NFS

    Network File System is a family of protocols for accessing files and directories on a remote server over a network.

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  16. Term

    NFS attribute cache

    An NFS attribute cache is a client-side copy of file or directory metadata reused until refresh or revalidation is required.

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  17. Term

    NFS COMMIT

    NFSv3 COMMIT requests stable storage of previously buffered writes and associated metadata for a specified file range.

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  18. Term

    NFS lookup cache

    An NFS lookup cache retains directory-name resolution results, including found and missing entries, subject to revalidation.

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  19. Term

    NFS open-file preservation

    NFS open-file preservation is the NFSv4.1 OPEN-result promise to retain a file removed while open, including through the server-restart grace period for open reclamation.

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  20. Term

    NFS silly rename

    NFS silly rename is a client workaround that temporarily renames an in-use file's directory entry and defers its removal until local references are released.

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  21. Term

    NFS write gathering

    NFS write gathering combines related server writes to share persistence work before sending their replies.

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  22. Term

    NFS write verifier

    An NFSv3 write verifier is a server cookie returned by WRITE and COMMIT that lets clients detect state changes that may have lost uncommitted writes.

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  23. Term

    NFSv4 file delegation

    An NFSv4 file delegation is a recallable server grant allowing a client to manage specified opens and cached file state locally while conflicting access is coordinated by the server.

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  24. Term

    NFSv4 grace period

    An NFSv4 grace period is a server recovery interval that protects the reclamation of previously held locking state from conflicting new access.

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  25. Term

    NFSv4 lease

    An NFSv4 lease is a renewable time interval during which the server maintains a client's locking state, subject to the protocol's revocation rules.

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  26. Term

    NFSv4 state reclaim

    NFSv4 state reclaim is the recovery of previously held open and locking state after the server loses that state, rather than the acquisition of unrelated new locks.

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  27. Term

    NFSv4 stateid

    An NFSv4 stateid is a protocol value identifying server-managed state such as an open, byte-range lock, delegation or layout.

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  28. Term

    no_path_retry

    no_path_retry is a DM Multipath setting that controls queueing behavior when every path to a mapped device is unavailable.

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  29. Term

    Noise-predictive maximum-likelihood detection

    Noise-predictive maximum-likelihood (NPML) detection incorporates noise prediction or whitening into sequence-detector branch metrics for a partial-response recording channel.

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  30. Term

    NOR flash

    A non-volatile flash memory architecture with cells connected in parallel, supporting random-address reads and commonly used to store executable code and firmware.

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