Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 14 of 29

A-Z

  1. Term

    Memory-mapped file

    A memory-mapped file exposes a file region through a process's virtual address space so its contents can be accessed with memory loads and stores.

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  2. Term

    Memristor storage

    A memristor is a circuit element proposed in 1971 that relates charge and magnetic flux; the term is also used for two-terminal thin-film devices whose resistance depends on past current and is changed by moving ions, which are researched as dense non-volatile memory (resistive RAM). The sources used here treat it as an emerging, researched memory technology, and it is not mainstream bulk storage.

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  3. Term

    Memtable

    A memtable is an in-memory structure that holds recent LSM-tree updates before they are flushed to sorted table files.

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  4. Term

    Merkle tree

    A Merkle tree combines hashes of data and child nodes into a root so that selected entries or subtrees can be checked without transferring the entire data set.

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  5. Term

    Metadata update dependency

    A metadata update dependency is an ordering requirement between persistent changes needed to preserve a filesystem invariant.

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  6. Term

    Metal particle tape

    Metal particle (MP) tape is magnetic tape whose recording layer is made of metal particles in a binder; the first LTO format (Ultrium-1, ECMA-319) requires such a metal-particle coating on 12.65 mm tape, before barium ferrite came into use from LTO-6.

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  7. Term

    Microwave-assisted magnetic recording (MAMR)

    Microwave-assisted magnetic recording (MAMR) denotes HDD write-assist approaches whose implementation must be distinguished: MAS-MAMR uses a microwave magnetic field to assist switching in the medium, while Toshiba's FC-MAMR strengthens the write field through flux control.

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  8. Term

    Microwave-assisted switching MAMR (MAS-MAMR)

    Microwave-assisted switching MAMR (MAS-MAMR) is a recording technique in which a spin-torque oscillator adds a microwave magnetic field to the write field, reducing the field needed to reverse magnetization in the recording medium.

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  9. Term

    mincore

    mincore is a system call that reports a page-residency vector for a mapped virtual-address range.

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  10. Term

    Minimum-storage regenerating code

    A minimum-storage regenerating code minimizes repair download at the minimum-storage point for a specified recovery threshold and helper count.

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  11. Term

    Mirror set

    A mirror set is a group of storage members configured to maintain copies of the same logical data.

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  12. Term

    Mirroring (storage)

    Storage mirroring maintains a copy of source data on another storage device or system.

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  13. Term

    Misdirected write

    A misdirected write stores an update at the wrong address or on the wrong device.

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  14. Term

    Mission-critical HDD

    A mission-critical HDD is a high-rotation-speed (10,000 or 15,000 rpm) enterprise hard drive, usually with a SAS interface and a small capacity per drive, built for low rotational latency and data-integrity features in transactional workloads that were served by spinning disks before flash.

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  15. Term

    MLC SSD

    An MLC SSD uses NAND flash that, in the two-bit sense of MLC, encodes two bits per cell using four threshold-voltage states.

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  16. Term

    Monotonic reads

    Monotonic reads is a session guarantee requiring successive reads to observe states that include the effects of writes relevant to the session's earlier reads.

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  17. Term

    Monotonic writes

    Monotonic writes requires every replica incorporating a later session write to incorporate the session's earlier writes and order them before it.

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  18. Term

    msync

    msync is an operation that synchronizes a range of a shared file-backed memory mapping with its underlying file, with MS_SYNC waiting for completion.

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  19. Term

    MTBF

    Mean time between failures (MTBF) is the expected operating time between successive failures of a repairable system under specified conditions.

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  20. Term

    Multi-level cell (MLC)

    NAND flash that stores two bits per cell using four distinguishable threshold-voltage states.

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  21. Term

    Multipart upload

    Multipart upload is an object-transfer process that sends numbered parts independently and assembles them into one object when the upload is completed.

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  22. Term

    Multipath I/O

    Multipath I/O manages multiple paths to the same storage device for failover and, where supported, load distribution.

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  23. Term

    NAND channel

    A NAND channel is a communication path between an SSD controller and flash components sharing its transfer resources.

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  24. Term

    NAND copyback

    NAND copyback relocates page data through an on-chip buffer to a destination page without transferring the payload to an external controller.

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  25. Term

    NAND cross-temperature effect

    The NAND cross-temperature effect is the change in read behavior associated with programming and subsequently reading a cell at different temperatures.

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  26. Term

    NAND die stacking

    NAND die stacking means putting several NAND flash dies into one package so that they share the package's pins and I/O bus while each die is selected by its own chip-enable signal, which raises the capacity per package.

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  27. Term

    NAND dwell time

    NAND dwell time is the interval between specified successive program or erase stress events on the same cells, during which partial self-recovery can occur.

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  28. Term

    NAND erase block

    A NAND erase block is a group of flash pages erased together by a block-erase operation.

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  29. Term

    NAND flash

    A non-volatile flash memory architecture with cells connected in series strings and data accessed through page-read, page-program and block-erase operations.

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  30. Term

    NAND page

    A NAND page is a group of data bits addressed together for a page read or program operation within an erase block.

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