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[ubuntu] A drive in a mdadm RAID1 array failed - ruined the array?

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http://ubuntuforums.org – I'm curious if anybody can piece together some degree of logic to my story. My server is running 12.04, and it has 3 drives installed. 160GB = OS 2x500GB (RAID1 Mirror via mdadm) = /media/NAS I noticed the files on my web server were gone one day, yet Apache was responding properly. I came home to find that Disk Utility reported one drive as healthy and the other as having "a few bad sectors." These drives are Seagates, and between the 2 I've already had 3 RMA's... this one marks the 4th. Anyway, I didn't know what to do, so I kicked out the problematic drive out of the array (Hardware)