Storage and Virtualization Definitions

  • F

    Fibre Channel port names

    Fibre Channel port names

  • H

    Hyper-V Virtual Fibre Channel

    Virtual Fibre Channel is a feature in Microsoft Hyper-V 3.0 that lets virtual machines (VMs) connect directly to Fibre Channel (FC)-based storage by using a standard World Wide Name (WWN) associated with a VM.

  • I

    I/O blender effect

    The I/O blender effect is a phenomenon in virtualized environments that degrades storage performance.  The I/O blender effect occurs when multiple virtual machines (VMs) all send their input/output (I/O) streams to a hypervisor for processing.

  • I/O contention (input/output contention)

    I/O contention (input/output contention), occurs when virtual machines compete for I/O resources because there is a limited storage bandwidth.

  • I/O virtualization (IOV)

    I/O virtualization (IOV), or input/output virtualization, is technology that uses software to abstract upper-layer protocols from physical connections or physical transports.

  • N

    N_Port ID virtualization (NPIV)

    N_Port ID virtualization (NPIV) is a technology that allows a single host bus adaptor (HBA) called an "N_Port" to register multiple World Wide Port Names (WWPNs) and N_Port identification numbers.

  • O

    ODX (Offloaded Data Transfer)

    Offloaded Data Transfer (ODX) is a feature in Microsoft Windows Server 2012 that speeds up copy and move operations by allowing them to be performed by the storage hardware rather than the operating system.

  • S

    storage virtualization

    Storage virtualization is the apparent pooling of data from multiple storage devices, even different types of storage devices, into what appears to be a single device that is managed from a central console.

  • T

    thick provisioning

    Thick provisioning pre-allocates storage capacity on a disk rather than on an as-needed basis.

  • V

    virtual LUN or thin LUN

    A virtual LUN (virtual logical unit number) is a representation of a storage area that is not tied to any physical storage allocation. Virtual LUNs are used in thin provisioning (also known as virtual provisioning) for storage area network (SAN) management. A virtual LUN is also sometimes called a thin LUN.

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