This outlines how to move data from one disk to another, newer, bigger disk. There may be better/more advanced ways to do this, but this uses simple tools and works pretty well.
First plugin the new disk to a secondary SATA/IDE port
Boot from the FreeBSD CD-ROM, and go to 'Configure', then 'fdisk'. Set it to use all disk, then 'W' to write the data
REBOOT, still with FBSD CD-ROM, go to 'Configure' and disklabel. Setup the disk how you want (unless you need something special, e.g. for EV, 'auto' default are probably fine.) Press 'w' to save your changes. For reasons unknown, the reboot is necessary between fdisk and disklabel.
Take out the CD-ROM, and boot into single user mode (from the original
OS)
Mount existing file systems:
Mount the secondary drive in a mount partition. If your new drive is on /dev/ad16, you'd type:
Verify old and new filesystems are mounted with df -h
Use dump/restore to copy data on the various partitions over:
cd /mnt
dump -0 -f - / | restore -r -f -
cd /mnt/var
dump -0 -f - /var | restore -r -f -
cd /mnt/usr
dump -0 -f - /usr | restore -r -f -
Once the copy is finished, turn off the machine, disconnect the old drive, and plug the new drive into its SATA port. You need to use the same port as the old drive, or else you'll have to edit the fstab file on the new drive to get the system to boot.
Make sure the
OS boots, and everything looks good. And you're done!