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How does parity on RAID 5 work?

post #1 of 2
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RAID five uses parity in 4 or more disks to protect against drive failure. But there is still only one copy of all data, so if a disk fails, how do you use parity to rebuild the lost data?

I'm trying to understand all RAID levels. I can handle 0, 1, and 0+1. I've read all the stuff I can find online, but somehow, I can't grasp it.
Wolfdale
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Wolfdale
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post #2 of 2
It is striped parity - parity is accross all the drives.

Decent description:
http://en.wikipedia.org/wiki/Redunda...t_disks#RAID_5
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