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    Dell RAID is 01 not 10

    IT Discussion
    raid perc lsi dell
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    • scottalanmiller
      scottalanmiller last edited by

      So very important discovery today. Dell PERC controllers say that they implement RAID 10 and their docs even include diagrams to show that it is RAID 10 but the actual RAID level is 01 which uses the same capacity and has the same performance but is dramatically less reliable.

      This is really important to know, especially with people attempting to use large shared storage like in a VRTX. This can really catch people by surprise.

      So typically Dell PERC setup will be RAID 01 for four drives and RAID 6 for larger arrays.

      1 Reply Last reply Reply Quote 1
      • ?
        A Former User last edited by

        So did they drop true RAID 10 support?

        1 Reply Last reply Reply Quote 0
        • scottalanmiller
          scottalanmiller last edited by

          Their tech has stated that they never had it!

          DenisKelley 1 Reply Last reply Reply Quote 0
          • DenisKelley
            DenisKelley @scottalanmiller last edited by

            @scottalanmiller
            Wow

            1 Reply Last reply Reply Quote 1
            • scottalanmiller
              scottalanmiller last edited by

              It's their use of the made up term "span" that is causing all kinds of confusion.

              1 Reply Last reply Reply Quote 0
              • scottalanmiller
                scottalanmiller last edited by

                We are digging hard to get answers. Lots if conflicting information.

                1 Reply Last reply Reply Quote 0
                • ?
                  A Former User last edited by

                  So we were never really using RAID 10? Sounds like if someone loses their data they could be in for some kind of legal suit.

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                  • scottalanmiller
                    scottalanmiller last edited by

                    Trying to really get confirmation. The old belief was that it was RAID 100 which is mathematically just as safe as RAID 10. But we don't know for sure yet.

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                    • T
                      technobabble last edited by

                      I had someone tell me that before but the Perc stated it was 10.

                      scottalanmiller 1 Reply Last reply Reply Quote 0
                      • scottalanmiller
                        scottalanmiller @technobabble last edited by

                        @technobabble I think we safely know it isn't 10. Dell refuses to commit to it being 10. They skirt the question every time. They've confirmed that at least one if their vendors mislabels it.

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                        • ?
                          A Former User last edited by

                          So does that mean no manufacturer is really supporting RAID 10?

                          scottalanmiller 1 Reply Last reply Reply Quote 0
                          • scottalanmiller
                            scottalanmiller @Guest last edited by

                            @thecreativeone91 don't know. But only Dell and LSI have the red flag "spans" thing going on which has no context in true RAID 10.

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                            • StrongBad
                              StrongBad last edited by

                              That's concerning, did they ever figure it out?

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                              • Reid Cooper
                                Reid Cooper last edited by

                                Make sure that you post back here when you learn more. Everyone is, I imagine, pretty interested in this one.

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