FreeBSD Move /usr or /var File System To Another Hard Disk

In FreeBSD, it is possible to move the /usr or /var file systems to another hard disk. The steps below will guide you through the process:

1. Backup the contents of the /usr or /var file system to the new hard disk. You can use rsync for this purpose:
   sudo rsync -avz /usr /mnt/new_disk


   In the above command, replace /usr with /var if you are moving the /var file system. Replace /mnt/new_disk with the mount point of the new hard disk.

2. Unmount the old /usr or /var file system:
   sudo umount /usr


   In the above command, replace /usr with /var if you are moving the /var file system.

3. Edit the /etc/fstab file and change the mount point of the /usr or /var file system to the new hard disk:
   # Before
   /dev/ada0p3 /usr ufs rw 2 2

   # After
/dev/ada1p3 /usr ufs rw 2 2


   In the above example, /dev/ada0p3 is the old partition and /dev/ada1p3 is the new partition. Replace /usr with /var if you are moving the /var file system.

4. Mount the new /usr or /var file system:
   sudo mount /usr


   In the above command, replace /usr with /var if you are moving the /var file system.

5. Reboot the system to ensure that the new file system is mounted correctly:
   sudo reboot


   After the system has restarted, verify that the new file system is mounted correctly:

   df -h


   The output should show the new mount point for /usr or /var.

   Note: If you encounter any issues during this process, it is recommended to boot the system from an installation disk or a recovery disk to make the changes.

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