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For a linux software RAID using madadm, does adding a harddrive and growing onto the RAID, destroy the data that's already on the RAID or does it preserve everything?

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See lots of related questions serverfault.com/search?q=raid5+grow –  Zoredache Mar 25 '10 at 16:51

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No, if you add a new drive and grow, you should not loose your data.

If you don't have a tested backup already you should make one. While nothing should go wrong there is always a small chance that something will go wrong.

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