Ok, I tried this a second time and it is totally reproducible. I will attach 
tarballs with screenshots clearly demonstrating the problem.  Here was the 
order of operations:
1. install with raid1 (images 462258_[123]*)
2. grab the install logs, shutdown the VM without booting, copy disks to backup
3. remove vda (using 'virsh define 462258_no_vda.xml') and try to boot (image 
462258_4*) -- FAIL
4. poweroff VM, remove vdb  (using 'virsh define 462258_no_vdb.xml') and try to 
boot (image 462258_5*) -- works
5. restore disks from backups made in step 2, add both disks back to VM using 
'virsh define 462258_both.xml'
6. boot with both disks, and run dpkg-reconfigure mdadm (images  462258_[67]*), 
then cleanly shutdown -- mdadm MAKEDEV failure
7. remove vda (using 'virsh define 462258_no_vda.xml') and try to boot (image 
462258_8*) -- FAIL

I also included the libvirt xml files for the VMs.

** Attachment added: "462258_images_and_xml.tar.gz"
   http://launchpadlibrarian.net/34539896/462258_images_and_xml.tar.gz

-- 
raid1 won't boot in degraded mode
https://bugs.launchpad.net/bugs/462258
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