Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 16 of 29

A-Z

  1. Term

    Normalized magnitude of data loss (NOMDL)

    Normalized magnitude of data loss (NOMDL) is the expected number of bytes lost per usable terabyte within a stated mission time.

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  2. Term

    NVDIMM-N

    NVDIMM-N is a standard DIMM that works as ordinary DRAM during normal operation and, when power is lost, copies its contents to flash on the same module using stored energy (a supercapacitor or similar), then restores them at the next boot; the host sees DRAM-speed, byte-addressable memory whose size is limited to the DRAM on the module.

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  3. Term

    NVM subsystem

    An NVMe system containing one or more controllers, domains and ports, with zero or more namespaces.

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  4. Term

    NVMe

    NVMe is a family of storage command and transport specifications for accessing non-volatile memory over PCIe and fabrics.

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  5. Term

    NVMe Available Spare

    NVMe Available Spare is the normalized percentage of spare capacity remaining in the NVM subsystem.

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  6. Term

    NVMe backplane

    An NVMe backplane is the board in a server or storage enclosure that carries PCI Express lanes, power and sideband signals from the host (or from a PCIe switch) to a row of drive-bay connectors, for example U.2 (SFF-8639) receptacles or EDSFF card-edge slots.

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  7. Term

    NVMe base specification

    The NVM Express Base Specification is the transport-independent core document of the NVMe family: it defines controller properties, the admin command set, queue mechanics and the common aspects of I/O command sets, while transport bindings and individual I/O command sets are separate documents.

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  8. Term

    NVMe Composite Temperature

    NVMe Composite Temperature is an implementation-specific temperature value in kelvins representing the controller and its associated namespaces in the SMART / Health Information log.

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  9. Term

    NVMe Controller Busy Time

    NVMe Controller Busy Time is the cumulative number of minutes during which the controller has an outstanding I/O command, as defined by the SMART / Health Information log.

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  10. Term

    NVMe Critical Composite Temperature Time

    NVMe Critical Composite Temperature Time is a cumulative SMART / Health log duration in minutes of controller operation with Composite Temperature at or above the critical composite-temperature threshold.

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  11. Term

    NVMe Critical Warning

    NVMe Critical Warning is the SMART / Health Information log bitmask identifying controller warning conditions at the time the log is read.

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  12. Term

    NVMe Data Units Written

    NVMe Data Units Written is the SMART / Health Information log counter of host-written data, excluding metadata, in rounded-up groups of 1,000 units of 512 bytes.

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  13. Term

    NVMe Device Self-test

    NVMe Device Self-test is an optional controller-executed diagnostic capability with short and extended operations whose namespace scope is selected by the initiating command.

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  14. Term

    NVMe Device Self-test log

    The NVMe Device Self-test log is log page 06h, which reports current operation progress and twenty slots for results of completed or aborted self-test operations.

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  15. Term

    NVMe discovery controller

    An NVMe discovery controller supplies information for locating NVM subsystems or other discovery services without exposing namespaces or implementing I/O queues.

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  16. Term

    NVMe Endurance Group

    An NVMe Endurance Group is a scope within which an NVM subsystem manages endurance.

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  17. Term

    NVMe Error Information Log Entries

    NVMe Error Information Log Entries is the SMART / Health Information log counter of Error Information log entries accumulated over the controller's life.

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  18. Term

    NVMe FDP

    An optional NVMe capability that lets a host guide write placement through placement identifiers while retaining conventional logical-block reads and writes.

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  19. Term

    NVMe Host Controlled Thermal Management

    NVMe Host Controlled Thermal Management is a controller feature through which a host configures temperature targets for automatic transitions to lower-power active power states or vendor-specific thermal actions.

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  20. Term

    NVMe Host Identifier

    The NVMe Host Identifier identifies which controllers in an NVM subsystem belong to the same host for purposes including reservation rights.

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  21. Term

    NVMe Media and Data Integrity Errors

    NVMe Media and Data Integrity Errors is the SMART / Health Information log counter of unrecovered data-integrity errors detected by the controller.

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  22. Term

    NVMe multipath

    Using multiple routes to the same NVMe namespace for path failover and, where supported, load distribution.

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  23. Term

    NVMe multipath I/O policy

    An NVMe multipath I/O policy is a host-side rule for choosing among eligible routes to one namespace.

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  24. Term

    NVMe namespace

    An NVMe resource collection that a host can address through a namespace identifier, such as formatted non-volatile storage.

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  25. Term

    NVMe namespace ID (NSID)

    An NVMe namespace ID (NSID) is a 32-bit handle used by a controller and host to address a namespace, not a globally unique namespace identity.

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  26. Term

    NVMe namespace identifiers

    NVMe namespace identifiers are the NGUID, EUI64 and namespace UUID values used to distinguish a namespace independently of its command-addressing NSID.

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  27. Term

    NVMe over Fabrics

    An extension that carries NVMe commands across RDMA, Fibre Channel, or TCP networks to remote namespaces.

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  28. Term

    NVMe Percentage Used

    NVMe Percentage Used is a vendor-specific estimate of the percentage of NVM endurance consumed by actual use.

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  29. Term

    NVMe Physical Region Page

    An NVMe Physical Region Page entry identifies a memory page or page portion used to transfer a command's data buffer.

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  30. Term

    NVMe placement identifier

    An FDP value combining a reclaim group identifier with a namespace-scoped placement handle that maps to a reclaim unit handle.

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