well, after upgrades to the nova installation that I was using, we are
no longer running our images backed by a qcow2 compressed image.
Instead, the root disk is a qcow2 disk backed by a "raw" disk image.
This obviously changes timing conditions as disk reads no longer take
cpu to do decompression.

I've now run 240 instances, and not been able to reproduce this with the
modified ramdisk to catch the output.

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https://bugs.launchpad.net/bugs/833783

Title:
  boot failure: can't open /root/dev/console: no such file

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