I'm trying to follow the stemcell instructions for brtfs  which involves
creating a large btrfs.img file using dd command.
I am trying to create it on a large volume, rather than the small root
mount that I have on my AWS VM; but the following command is unmounting the
I have a 32G volume at /var/vcap/store, and /var/vcap/store/tmp already
exists, and I am running
dd if=/dev/zero of=/var/vcap/store/tmp/btrfs.img bs=1M count=10k
If I check df shortly after starting this command, the /var/vcap/store
mount has disappeared.
Is this a feature/bug of dd? How can I stop it doing this?