Does RAID 1 protect against corruption?

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Posted by Shaun on Super User See other posts from Super User or by Shaun
Published on 2010-02-24T02:48:34Z Indexed on 2010/06/04 6:10 UTC
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Does Raid 1 protect against data corruption? For example, let's say that I am keeping all of my important files on a NAS that uses 2 disks in a RAID 1. If one hard drive has some kind of internal problem and the data becomes corrupted, does the RAID recognize this automatically and correct it using data from the other good disk?

Could it even know which copy is the good one?

Does RAID 5 protect against corruption?

I know that RAID is not a backup solution. I am trying to figure out how to make sure that I am not backing up corrupt data!

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