title: is it possible to speed up writes inside a docker container?
body: <p>I have a very large file in my docker container (it's a virtualbox image) which --- unfortunately -- must be modified as part of running it. Docker's copy-on-write policy works against me here and unfortunately any mutation/copying of the file takes about 10 minutes, compared to about 10 seconds to copy the same file on the host.</p>
  
  <p>Can anything be done to speed up the creation/copy of very large files within a docker container? Note that this is an entirely transient file that I do not need to persist after the container is closed.</p>