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[all variants] Is it possible to create a RAID of / after the OS has been installed?

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http://ubuntuforums.org – So I was wondering if it might be possible to do a "normal" install of a Linux OS on a single drive and then add a second drive later that just happens to be identical, partition it with the same layout as the original drive and turn the two into a RAID 1 array. This is actually a generic Linux question that I wanted to post here because this forums rocks and people respond fast. What I'm actually trying to setup is CentOS 5 with a software RAID. I was previously successful in doing this with Ubuntu 10.04 LTS but unfortunately the third party software I needed to install after s (Hardware)