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Re: Is RAID 6 better than RAID 10 ?

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A rather biased and not very accurate description of the advantage of RAID 6 of 10.

RAID 10 has one very distinct advantage over RAID 6 (or any other parity based RAID topography), and yet it's omission is the stuff of legend and near hysterical denial.

Quite simply, RAID 10 can take a hard controller fault while RAID 5/6 can't. That is, unless you've got redundant controllers *AND* the non faulting controller is smart enough to know the other controller is faulty, which is frequently not the case. The faulting controller continues to write garbage, and once that parity degradation > two drives you are screwed.

In my 15 years of corporate data center experience statistically I find the odds of controller failure > the odds of two drives failing. I bigger problem is most of the time multiple drives are detected as being faulty the problem is often *not* with the drives but with the controller. Yet we continue to blame multiple drives failing as an issue with the HD's themselves.

RAID 10 constitutes easy space calculation and linear performance plots. RAID 6 requires a Ouiji board because no hardware vendor implements it the same way, and you are not allowed to even discuss the option of controller failures because we all know in the fantasy world of mass storage vendors it never happens. In my world of reality controller faults, even those corrected by firmware updates exceeds the chance of multiple drive failure.

Last, if anybody wants to put identical RAID 6 and RAID 10 based SANs in a room, and then remove the AC unit, I'll happily put any amount of money on the RAID 10 unit staying up longer at higher temps before corrupting LUNs.

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