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In short, I want to create a system restore image. My idea with AUFS is like the image belowAUFS union root

Now, as I require this mount setup at boot-time, I don't think I can do it with fuse and will require AUFS kernel support, which, CentOS 6.x doesn't have. So I started to think along an alternative approach with LVM snapshots. The setup I have in mind is like following imageLVM snapshot mount

However, I have a few questions about this setup.

  1. Is this kind of setup at all possible with LVM or device mapper? If yes, how to do it?
  2. with LVM, is it guaranteed to have write-protection in physical volume for read-only snapshots?

Thanks in advance.

Samik
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