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  • 1.  RAID6(6D+2P) or RAID6(14D+2P) is best on VSP 5600?

    Posted 09-12-2022 11:10
    Hi Team,

    Is RAID6(6D+2P) or 14D+2P is best while considering rebuild and resiliency etc ?  What is the rebuild time with 15TB nvme for both the RAID groups?

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    G Gopi
    Systems Engineer
    World Wide Technology, LLC
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  • 2.  RE: RAID6(6D+2P) or RAID6(14D+2P) is best on VSP 5600?

    Posted 11-04-2022 02:13

    Both are the same for resiliency.

    To rebuild time with 15TB NVME  for  RAID6 (14D+2P), the correction copy time of NVMe SSDs might be taken a longer time.



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    Mousumi Ghosh
    Software QA Engineer
    Hitachi Vantara
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  • 3.  RE: RAID6(6D+2P) or RAID6(14D+2P) is best on VSP 5600?

    Posted 11-07-2022 05:25
    In terms of rebuild time, for the same usage, 14D+2P will take lesser time. However, it can withstand 2 drive failure per 16 drives, whereas 6D+2P  can withstand 2 drive failures per 8 drives. One other consideration related to space usage is 14D+2P will result into higher usable spaces for same number of drives when compared to 6D+2P

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    Debdatta Chattopadhyay
    Hardware Test Engineer - Senior
    Hitachi Vantara
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  • 4.  RE: RAID6(6D+2P) or RAID6(14D+2P) is best on VSP 5600?

    Posted 11-04-2022 07:14
    In terms of resiliency point of view, RAID 6 (6D+2P) would be the best choice when compared with RAID6 (14D+2P), because 6D+2P can sustain 2 drives failure out of 8 drives, but with 14D +2P configuration, it can sustain only 2 drives failure out of 16 drive.

    The rebuild time in RAID 6 (14D+2P) will take lesser time because the data parity will be distributed across all the drives & all the healthy drives will be used in the rebuild operation. So, If you have a higher number of drives in the parity group, the rebuild operation would be quicker.

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    Sumit Keshri
    Senior Test Engineer
    Hitachi Vantara
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