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RAID 5 Question

Discussion in 'PC Hardware' started by Dcrypter, 2006/01/09.

  1. 2006/01/09
    Dcrypter

    Dcrypter Inactive Thread Starter

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    RAID 5 I understand requires a minimum of 3 drives (the same size is preferable).
    2 Drives are stripped together and the third drive is parity.

    What I wanted to know is if you have a RAID 5 array of 4 harddrives, and 2 drives crash (OS will probably crash at the same time) can you rebuild the array with the parity drive and 1 data drive?

    Ofcourse when I mean rebuild you will need the RAID 5 rebuild utility that came with RAID controller.

    Basically in larger RAID 5 arrays how many drives do you need to rebuild the array.
     
    Dcrypter,
    #1
  2. 2006/01/09
    Arie

    Arie Administrator Administrator Staff

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    Nope, that is RAID 4.

    RAID 5 stripes both data and parity information across three or more drives.

    And NO, RAID 5 can only tolerate 1 lost drive. With two drive failures you'll be out of luck.

    You'll need RAID 6 to be able to "survive" a two drive failure. It does require a minimum of four hard disks & a specialized (usually = expensive) hardware controller.
     
    Arie,
    #2


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  4. 2006/01/10
    Dcrypter

    Dcrypter Inactive Thread Starter

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    Too much RAID :D .
    Anyway thanks for clearing that for me. As RAID has way too many combinations to remember all the specs for each
     
    Dcrypter,
    #3

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