pwendell/spark-ec2 — pull request #1 by kayousterhout (2014-01-20 23:40:42+00:00)
Title: Find mounted devices and not EBS ones.

The existing version struggled because some of the /mnt directories weren't actually mounted (/mnt3 and /mnt4 for the instance type I was using) and also because one was the EBS one (xvda1), which caused problems