adding a new var partion to existing install
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				- boot from a livecd,
 - mount / (on /mnt/gentoo) and new-var (on /mnt/new-var)
 - rsync dir contents
 
rsync -av /mnt/gentoo/var/ /mnt/new-var
- edit /etc/fstab to reflect the new location of /var ... remove or backup the old /var/* ... reboot
 
- note: the slashes on directory names are not accidental ... so no trailing slash on /mnt/new-var