Greetings!
In my Vagrantfile, I have:
ENV['VAGRANT_EXPERIMENTAL'] = 'disks'
This causes the following (annoying) warning to be printed with every vagrant command:
==> vagrant: You have requested to enabled the experimental flag with the following features:
==> vagrant:
==> vagrant: Features: disks
==> vagrant:
==> vagrant: Please use with caution, as some of the features may not be fully
==> vagrant: functional yet.
Thank you!