Paul, ah ok, so the RAID setup is just a JBOD one (basically glueing
together the individual parts of the SSD). That explains the boot
messages (because the partition table was created over the length of the
RAID). And just a word of warning: at least in my experience grub in the
past had no concept of RAID setups. So it was essential to have at least
/boot on a partition that is accessible natively. In your case this just
might about work since the first partition covers the whole first disk.
But it also continues after and I am not sure that the files in /boot
always will remain in the areas of the first disk. Must admit that grub2
may be more capable than I think. This limitations are from a bit back
in time. But at least being cautious here cannot go wrong. ;)

But for the current problem: the simplest way to gather output in such
cases is by using a usb stick which you can mount in the busybox shell
and then redirect output there.

The rename error is weird. Even more since your later ls shows the node
is correctly named. About the vgchange command. I think that was just an
incorrect assumption from my side. I was just assuming you would be
using lvm volumes on top of the RAID (which I was guessing to be in some
other mode like striping, mirror or raid5). But it looks like Volume0p1
could just be your / and Volume0p5 be your swap partition (note "dmsetup
ls" is another nice way to list currently available device mapper
volumes). So maybe you were just about there and exit would have
completed the boot.

If that works the next step would be to have --debug on the grub command
line which enables debugging output of the upstart system. That should
show up in /var/log/boot.log and/or /var/log/syslog. Maybe that will
show what is going wrong. Oh, in the busybox, maybe have a look at
scripts/init-premount, there should be a dmraid file.

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https://bugs.launchpad.net/bugs/948291

Title:
  New 12.04 beta Kernel doesn't support booting from dmraid

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