HOWTO: Move FreeBSD to a new hard disk

Let's assume that our FreeBSD installation is on a 4 gigabyte drive (ide master ad0) and we would like to
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it to a
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20 gig drive.
What you need to do is remove the old
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, install the new [20G] drive as an ide master and perform a minimal clean install of FreeBSD, setting up the partitions exactly how you want them. Be se sure to set the drive as bootable and boot from it one time as a test.
Next, put your old [4G] drive back in the system as an ide master and the new [20G] drive in as an ide slave. Boot the system on your old installation in single user mode.
To boot in single user mode:
Press the [spacebar] at the 10 second countdown.
type:
boot -s
Press [enter] for the default
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.
At the (#) prompt type:
fsck -p
mount -u /
mount -a
swapon -a
adjkerntz -i
Next, make sure you have the device files made so you can mount the partitions on the slave drive.
Type:
cd /dev
./MAKEDEV ad1s1a
./MAKEDEV ad1s1e
./MAKEDEV ad1s1f
Now make mount points for the new drive's partitions:
Type:
mkdir /backup
mkdir /backup/root
mkdir /backup/usr
mkdir /backup/var
Lastly, I use a shell script to do the following:
1 - create new filesystems (newfs the drive)
2 - mount the partitions
3 - dump the data from my old drive, and restore it to my new one
4 - unmount the new drives partitions
5 - enable softupdates on the new drive (optional)
Here is the script I use:
#!/bin/sh
newfs /dev/ad1s1a
newfs /dev/ad1s1e
newfs /dev/ad1s1f
mount /dev/ad1s1a /backup/root
mount /dev/ad1s1e /backup/var
mount /dev/ad1s1f /backup/usr
( dump -0f - / ) | ( cd /backup/root ; restore -rf - )
( dump -0f - /var ) | ( cd /backup/var ; restore -rf - )
( dump -0f - /usr ) | ( cd /backup/usr ; restore -rf - )
umount /backup/root
umount /backup/var
umount /backup/usr
tunefs -n enable /dev/ad1s1a
tunefs -n enable /dev/ad1s1e
tunefs -n enable /dev/ad1s1f
#end
It will probably take several hours to perform the dump/restore, so be patient. Once the data has been dumped and restored to the new drive, all you have to do is remove your old drive and put it in a safe place, set the new drive to a master and reboot. Your system will now boot your old FreeBSD installation on your new hard disk.
Note: You can download the drivecopy shell script by clicking on the drivecopy.tar filename located on the right sidebar of this page. Issue the command tar xvf drivecopy.tar to untar the drivecopy.sh file.

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