Storage Technology Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing storage and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • H

    hot plug

    Hot plug is the addition of a component to a running computer system without significant interruption to the operation of the system.

  • hot spare

    A hot spare, also called a hot standby, is a backup component that can be placed into service immediately when a primary component fails. 

  • How many bytes for...

    This page provides tables and other information about how many bytes are required (how much computer storage) for various information objects or purposes; it also summarizes some facts that have been gathered about how much information exists in the world and, where appropriate, how much computer storage this requires.

  • HSM (Hierarchical Storage Management)

    HSM (Hierarchical Storage Management) is policy-based management of file backup and archiving in a way that uses storage devices economically and without the user needing to be aware of when files are being retrieved from backup storage media.

  • HVD (holographic versatile disc)

    Holographic versatile disc (HVD) is a medium of holographic storage that looks like a DVD but is capable of storing far more data... (Continued)

  • hybrid cloud hosting

    Hybrid cloud hosting allows organizations to provision dedicated servers and storage and cloud servers and storage on the same network.

  • Hybrid Cloud Storage

    Hybrid cloud storage is an approach to managing storage that uses both local and off-site resources.

  • hybrid flash array

    A hybrid flash array is a solid-state storage system that contains a mix of flash memory drives and hard disk drives.

  • hybrid hard drive (HHD)

    A hybrid hard drive (HHD), sometimes known as a solid-state hybrid drive (SSHD), is a mass storage device that combines a conventional hard disk drive and a NAND flash module.

  • 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.

  • IBM General Parallel File System (IBM GPFS)

    The IBM General Parallel File System is one of the top file systems used in high-performance computing and the basis for many storage products used in supercomputing.

  • IBM racetrack memory

    Racetrack memory is a type of non-volatile, solid-state nanotech memory being developed by IBM.

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