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I have a RAID 1 mirror on a Lacie 2 Big USB3. When I break the mirror by pulling out one drive, keep making changes on the remaining drive and finally put the first one back in, the drives stay happily out of sync. The unit doesn't seem to detect the mirror was broken. The manual only explains the steps to take to replace a failed drive with a new drive. Does it only re-mirror if the replacement drive is new? What does it look at to determine that?

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How do you know it's staying out of sync? Often RAIDs will just resynchronize in the background, and if the differences are not huge, it may not take very long to copy them. This is different than a "rebuild" which implies a complete copy of the data to the new/replacement drive. –  techie007 May 26 '12 at 19:11
    
According to the manual the leds give status information which in this case is: "All Normal". If I don't do anything further the unit goes to sleep so it clearly thinks it has no work to do. However, when I look at the drives one at a time I see the changes I made above are only on one of them. –  vhauf May 26 '12 at 19:33
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