RAID Definitions

  • D

    disk cache

    A disk cache is a mechanism for improving the time it takes to read from or write to a hard disk.

  • disk duplexing

    Disk duplexing is a variation of disk mirroring in which each of multiple storage disks has its own SCSI controller.

  • disk striping

    Disk striping divides data into blocks and spreads the blocks across hard disks or solid-state drives to accelerate read and write access.

  • double-parity RAID

    Double-parity RAID (redundant array of independent disks), also called diagonal-parity RAID, Advanced Data Guarding (RAID_ADG), or RAID-6, is a method of protecting against multiple storage drive failures by creating two sets of parity data on an array of hard disks.

  • H

    hard disk

    A hard disk is part of a unit, often called a "disk drive," "hard drive," or "hard disk drive," that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces.

  • hard disk drive (HDD)

    Hard disk drives are a type of physical storage media that use spinning disk platters to store nonsequential data in personal computers and enterprise data centers.

  • hardware RAID (hardware redundant array of independent disk)

    Hardware RAID is a form of RAID where processing is done externally.

  • 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. 

  • P

    parity

    Parity is a method of detecting errors in data transmissions between computers, while parity bit and parity checking are used in RAID technology to guard against data loss.

  • R

    RAID (redundant array of independent disks)

    RAID (redundant array of independent disks) is a way of storing the same data in different places on multiple hard disks to protect data in the case of a drive failure.

  • RAID 0 (disk striping)

    RAID 0, also known as disk striping, is a technique that breaks up a file and spreads the data across all the disk drives in a RAID group.

  • RAID 10 (redundant array of independent disks)

    RAID 10, also known as RAID 1+0, combines disk mirroring and disk striping to protect data.

  • RAID 2

    RAID 2 is a technique that stripes data at the bit level using a Hamming code to detect errors.

  • RAID 3 (redundant array of independent disks)

    RAID 3 is a RAID configuration that uses striping and parity, but it uses a parity disk to store the parity information generated by a RAID controller instead of striping it with the data.

  • RAID 4 (redundant array of independent disks)

    RAID 4 is a RAID configuration that uses a dedicated parity disk and block-level striping across multiple disks.

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