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How to properly rebuild raid 1 array as to not lose data, Intel raid.

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I am repairing a raid 1 array on an Intel integrated raid solution on a p4 Dell xps. One of the two identical 250 gb sata drives has failed and the array is operating from the one drive. Thanks to ebay I have another identical drive. Should I just attach the new drive and it will rebuild? Or do I need to unraid and go to a single drive then add the new drive and build a new array? I just want to ensure it does not build from the new blank drive. I will make a ghost first to be safe but want things to go as smoothly as possible. Thanks all in advance!

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It should rebuild from the last drive that was booted from. I had the opportunity to try this on an ICH7 based server with non-hot-pluggable drives earlier this week, and even though the disk I was inserting had previously been part of the same RAID array, it still rebuilt the array from the last drive that had successfully booted on that system.

Quick answer: yes, you can just put the new drive in and it will rebuild.

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