RAID 5 Newbie

Discussion in 'Mac Accessories' started by cwazytech, Dec 26, 2012.

  1. cwazytech macrumors 6502

    Joined:
    Jan 7, 2009
    Location:
    Colorado
    #1
    So I am switching from a MyBook Live Duo to a 4 Bay QNap Nas drive with four 2TB drives for a total of 8TBs. I've only ever had experience with a RAID 1 configuration, and now I'm using a RAID 5 configuration. Can someone please explain how I have over 5 TBs of available space. My understanding is RAID 5 is more secure, but in a RAID 1 configuration I only have access to half of the total space. Why does RAID 5 give me more?
     
  2. cwazytech thread starter macrumors 6502

    Joined:
    Jan 7, 2009
    Location:
    Colorado
    #2
    And....

    Which RAID option is best for data protection or protect against data loss?
     
  3. WesCole macrumors 6502a

    Joined:
    Jul 1, 2010
    Location:
    Texas
    #3
    Raid 5 uses one drive for parity, so you should get the majority of the other drives' usable space for storage. The formula for space is:

    (Number of Drives - 1) * Size of smallest drive = Approx. usable storage.

    In your case: (4 - 1) * 2 = ~6TB of usable space.

    Here is a good link to read about it: http://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_5
     

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