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Periodically run the one-liner above if/when there are significant changes to the files in /usr/
= Before rebooting, add following to /etc/fstab : =
/squashed/usr/usr.sfs /squashed/usr/ro squashfs loop,ro 0 0
usr /usr aufs udba=reval,br:/squashed/usr/rw:/squashed/usr/ro 0 0
No need to delete original /usr/ ! (unless you don't care about recovery). Also AuFS does not work with XFS
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