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    Technology Talks

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    Krellyn

    Posts : 813
    Join date : 2011-04-07
    Age : 25

    Technology Talks

    Post by Krellyn on 2011-11-04, 19:22

    Studying for an Information Systems exam tomorrow. This is what I have learned in the last 3 minutes:

    RAID: Hard Drives Working Together

    Two or more hard drives work together as an array of drives
    --Improves fault tolerance
    --Improves performance

    Most common RAID levels
    --RAID 0, RAID 1, RAID 5

    Spanning or JBOD (Just a Bunch of Disks)
    --Two hard drives configured as a single volume

    RAID is accomplished using hardware or software

    Just a bunch of disks, huh.
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    Onlyme

    Posts : 357
    Join date : 2010-12-26
    Age : 27
    Location : On the Server

    Re: Technology Talks

    Post by Onlyme on 2011-11-04, 20:47

    Krellyn wrote:Studying for an Information Systems exam tomorrow. This is what I have learned in the last 3 minutes:

    RAID: Hard Drives Working Together

    Two or more hard drives work together as an array of drives
    --Improves fault tolerance
    --Improves performance

    Most common RAID levels
    --RAID 0, RAID 1, RAID 5

    Spanning or JBOD (Just a Bunch of Disks)
    --Two hard drives configured as a single volume

    RAID is accomplished using hardware or software

    Just a bunch of disks, huh.

    RAID = Redundant Array of Inexpensive Disks.

    Raid 0 - Block level Striping.
    - All data split between disks.
    - Zero fault tolerance. If data is corrupt on one drive, goodbye!
    - Best Read/Write performance
    Raid 1 - Mirror.
    - All data copied onto the disks.
    - Highest fault tolerance.
    - If Data isn't corrupt on one drive, you can rebuild it all.

    Raid 5 - Block-level striping with distributed parity.
    - Requires (N-1) drives.
    - (If you have 3, you have the performance of 2 If you have 6, you have performance of 5, etc..)
    - Allows 1 drive to fail. If more than 1 fails, data loss will happen.

    JBOD = Just a Bunch Of Drives. Refers to multiple drives in any format.
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    Krellyn

    Posts : 813
    Join date : 2011-04-07
    Age : 25

    Re: Technology Talks

    Post by Krellyn on 2011-11-04, 21:07

    Onlyme wrote:
    Krellyn wrote:Studying for an Information Systems exam tomorrow. This is what I have learned in the last 3 minutes:

    RAID: Hard Drives Working Together

    Two or more hard drives work together as an array of drives
    --Improves fault tolerance
    --Improves performance

    Most common RAID levels
    --RAID 0, RAID 1, RAID 5

    Spanning or JBOD (Just a Bunch of Disks)
    --Two hard drives configured as a single volume

    RAID is accomplished using hardware or software

    Just a bunch of disks, huh.

    RAID = Redundant Array of Inexpensive Disks.

    Raid 0 - Block level Striping.
    - All data split between disks.
    - Zero fault tolerance. If data is corrupt on one drive, goodbye!
    - Best Read/Write performance
    Raid 1 - Mirror.
    - All data copied onto the disks.
    - Highest fault tolerance.
    - If Data isn't corrupt on one drive, you can rebuild it all.

    Raid 5 - Block-level striping with distributed parity.
    - Requires (N-1) drives.
    - (If you have 3, you have the performance of 2 If you have 6, you have performance of 5, etc..)
    - Allows 1 drive to fail. If more than 1 fails, data loss will happen.

    JBOD = Just a Bunch Of Drives. Refers to multiple drives in any format.

    Pretty much sums up the chapter hahaha.

    I just love the name "Just a Bunch of Drives."

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