Messages in this thread | | | Date | Thu, 19 Jan 2006 21:14:28 +0100 (CET) | From | Martin Drab <> | Subject | Re: RAID 5+0 support |
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On Thu, 19 Jan 2006, Phillip Susi wrote:
> Martin Drab wrote: > > Speed is the issue here, I believe. By stripping two RAID-5 arrays you ought > > to get the reliability of the RAID-5 but with considerably higher speed. > > That's basically why RAID-50 exists, I think. > > One big raid-5 would have higher speed because it would have one more disk > allocated to storing data rather than more parity. The raid 5+0 isn't really > going to be any more reliable because it can withstand a single failure in > either half, but not two failures in one half, so in the face of a double > failure, you have a 50/50 chance of one being in each half.
Well, yes and no. See for instance:
http://en.wikipedia.org/wiki/RAID#RAID_50_.28RAID_5.2B0.29
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