In many time you are facing problem in administering the Email server of FreeBSD.
some of these problem is the stuck when the system boot as example mount root.
You will bump into a FreeBSD
It's actually very simple to solve this situation and to get your system up and running again. If you're not familiar with the mount command then this a great time to familiarize yourself. You can read the man page at http://www.freebsd.org/cgi/man.cgi?query=mount&apropos=0&sektion=0&manpath=FreeBSD+6.2-RELEASE&format=html.
Solving the problem. When you get the
First, the message will probably be something like it 'couldn't mount root from ufs:/dev/ad8s1a' (or whatever your disk was). And above it, you should see your new disks set up (i.e. ad0 19877 Seagate, ad1 19871 Maxtor, etc). You should be able to recognize your old drive by HD size+brand or some other subtle difference (here we will assume that your drive became ad0 from ad8).
In single-user mode, you can look at your current fstab file where the mount devices are specified.
# cat /etc/fstab
Then mount your /var, /tmp, /usr just like in your fstab but changing the disk number
# mount -t ufs /dev/ad0s1d /var
# mount -t ufs /dev/ad0s1e /tmp
# mount -t ufs /dev/ad0s1f /usr
You can confirm your mounts by typing either of these two commands:
# mount -p
Make root writable so that you can update fstab
# mount -uw /
Update fstab with the correct disk IDs.
# vi /etc/fstab
Save it and reboot
Welcome back to your system