raid 3,5,10,30,50?

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Thread: raid 3,5,10,30,50?

  1. 09-23-2003, 02:17 PM #1
    PCJ
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    raid 3,5,10,30,50?

    I know about raid 0, 1 and 0+1, but I saw an ad for a server with 16 Raptors, that could do RAID 0, 1, 0+1, 3, 5, 10, 30 and 50. What are these and how crazy are they?
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  2. 09-23-2003, 02:39 PM #2
    s1203372
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    Re: raid 3,5,10,30,50?

    Originally posted by PCJ
    I know about raid 0, 1 and 0+1, but I saw an ad for a server with 16 Raptors, that could do RAID 0, 1, 0+1, 3, 5, 10, 30 and 50. What are these and how crazy are they?
    RAID 0: stripe across each drive
    RAID 1: mirror each drive onto another
    RAID 0+1: stripe across 1/2 the drives, mirror onto the other half
    RAID 3: stripe across all drives but 1, store parity calcs on last drive for recovery
    RAID 5: same as 3, but the parity is distributed among all drives
    RAID 10: same as RAID 0+1
    RAID 30: A form of RAID on RAID - use multiple RAID 3 arrays and stripe across each array
    RAID 50: same as 30, but using RAID 5 arrays as the base unit
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  3. 09-23-2003, 05:21 PM #3
    Uzona
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    Re: Re: raid 3,5,10,30,50?

    Originally posted by s1203372
    RAID 0: stripe across each drive
    RAID 1: mirror each drive onto another
    RAID 0+1: stripe across 1/2 the drives, mirror onto the other half
    RAID 3: stripe across all drives but 1, store parity calcs on last drive for recovery
    RAID 5: same as 3, but the parity is distributed among all drives
    RAID 10: same as RAID 0+1
    RAID 30: A form of RAID on RAID - use multiple RAID 3 arrays and stripe across each array
    RAID 50: same as 30, but using RAID 5 arrays as the base unit
    Pretty good breakdown, However I have to nitpick at something.

    Raid 10 is not quite the same as 0+1. The order of the numbers is important.

    Raid 0+1 means stripe(0) first, then mirror(1) the stripe. You end up with two stripes that are mirrors of each other. If you lose 1 disk you lose that entire stripe. Lose a second disk in the mirror and you've lost everything.

    Raid 10 means mirror(1) first, then stripe(0). This method provides better data redundancy as you can lose multiple drives without losing any of your data. The only way you lose your data if you lose both stripes of a single mirrored set. Hope that makes sense, it's kind of difficult to explain without drawing a diagram.
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  4. 09-24-2003, 11:43 AM #4
    Sandro
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