Github user darabos commented on the pull request:
https://github.com/apache/spark/pull/2081#issuecomment-53856243
Wow, you're right, I hadn't read this line before.
> When you launch an M3 instance, we ignore any instance store volumes
specified in the block device mapping for the AMI.
Jesus Christ, Amazon, why do you hate us so?
I've changed it to respect `get_num_disks()` and to only do this for M3.
Thanks!
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