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Wanted to know why only RAID-6(6D2P, 14D2P)) and not RAID-5 is applicable for GAD/HUR of the data protection solution?

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  • 1.  Wanted to know why only RAID-6(6D2P, 14D2P)) and not RAID-5 is applicable for GAD/HUR of the data protection solution?

    Posted 30 days ago
    I see that all tthe HUR/GAD solutions always have RAID-6 drives and not RAID-5 drives, as I am not from a hardware background curious to know why RAID-6 works over RAID-5

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    Venkata Sai Sarath Sarma Vadlamannati Lakshmi
    Software Development Engineer
    Hitachi Vantara
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  • 2.  RE: Wanted to know why only RAID-6(6D2P, 14D2P)) and not RAID-5 is applicable for GAD/HUR of the data protection solution?

    Posted 28 days ago
    RAID-6 is similar to RAID-5, except that it uses double parity for enhanced fault tolerance. If two disks fail simultaneously, RAID 6 can reconstruct the data with double parity. RAID-6 is highly secure and fault-tolerant and this is the reason why RAID-6 is used in HUR/GAD solutions.

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    Sirish Bhatnagar
    Master Technical Program Manager
    Hitachi Vantara
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  • 3.  RE: Wanted to know why only RAID-6(6D2P, 14D2P)) and not RAID-5 is applicable for GAD/HUR of the data protection solution?

    Posted 27 days ago
    Great question.  It's about reliability, and not about HUR or GAD.  We always recommend RAID6 for data reliability, and our 100% Data Availability Guarantee requires it.  RAID5 (and RAID10) works, but isn't best practice.

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    John McDevitt
    Senior Director, Infrastructure Product Management
    Hitachi Vantara
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