If your answer was RAID-5, you are correct!

RAID-5: Striped parity. The parity at this level is divided up, with a share being given to each disk in the array. This sharing will balance and reduce the performance impact that is evident in RAID-4 implementations. In software implementations of this array, which are fairly common, performance will often become unacceptably slow if writes make up any more than about 15% of disk activity.

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This was first published in April 2005

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