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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 11-04-2022 06:15
    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 11-06-2022 14:59
    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 11-07-2022 09:24
    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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