1. use mkfile(1M) to add swap file

• mkfile -v 64m swapfile
• swap -a /path/to/swapfile
• swap -lh
• swap -d /path/to/swapfile 

2. use mkfile(1M) to learn zfs

• mkfile 64m /tmp/a /tmp/b /tmp/c
• zpool create mypool mirror /tmp/a /tmp/b
• zpool status 

3. use mkfile(1M) to create a UFS inside one file

•  Create file: # mkfile 200m /export/home/test
• Attach file to a block device: # lofiadm -a /export/home/test then /dev/lofi/1 will be created
• Create a UFS file system: # newfs /dev/rlofi/1
• Mount device: # mount /dev/lofi/1 /mnt
• Display the space: # df -h /mnt
• Unmount: # umount /mnt
• Delete block device: # lofiadm -d /dev/lofi/1