A complete Vagrantfile with additional hard drives

Vagrantfile_multiple_hds

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Reference: 
# http://zacklalanne.me/using-vagrant-to-virtualize-multiple-hard-drives/

Vagrant.configure(2) do |config|  
  config.vm.box = "geerlingguy/ubuntu1604"

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  config.vm.network "private_network", ip: "192.168.30.200"

  parityDisk = './parityDisk.vdi'
  dataDisk1 = './dataDisk1.vdi'
  dataDisk2 = './dataDisk2.vdi'

  config.vm.provider "virtualbox" do |vb|
    vb.memory = "2048"

    # Building disk files if they don't exist
    if not File.exists?(parityDisk)
      vb.customize ['createhd', '--filename', parityDisk, '--variant', 'Fixed', '--size', 10 * 1024]
    end
    if not File.exists?(dataDisk1)
      vb.customize ['createhd', '--filename', dataDisk1, '--variant', 'Fixed', '--size', 10 * 1024]
    end
    if not File.exists?(dataDisk2)
      vb.customize ['createhd', '--filename', dataDisk2, '--variant', 'Fixed', '--size', 10 * 1024]

      # Adding a SATA controller that allows 4 hard drives
      vb.customize ['storagectl', :id, '--name', 'SATA Controller', '--add', 'sata', '--portcount', 4]
      # Attaching the disks using the SATA controller
      vb.customize ['storageattach', :id,  '--storagectl', 'SATA Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', parityDisk]
      vb.customize ['storageattach', :id,  '--storagectl', 'SATA Controller', '--port', 2, '--device', 0, '--type', 'hdd', '--medium', dataDisk1]
      vb.customize ['storageattach', :id,  '--storagectl', 'SATA Controller', '--port', 3, '--device', 0, '--type', 'hdd', '--medium', dataDisk2]
    end
  end

  config.vm.provision "shell", inline: <<-SHELL
    sudo mkfs.ext4 /dev/sdb
    sudo mkfs.ext4 /dev/sdc
    sudo mkfs.ext4 /dev/sdd
  SHELL

end