Managed to get the system bootable again.
>From the rescue CD, I did these steps:
Do NOT assemble any raids. Start a shell on the rescue root file system.
Then: 
dmraid -ay
mount /dev/mapper/isw_isw_cbfbcabehj_Volume0p1 /mnt
mount -o bind /mnt/dev /dev
mount -t proc none /mnt/chroot/proc
chroot /mnt /bin/bash
grub-install /dev/dm-0

reboot!

(please note, the above commands were recreated from memory, but the
main idea is that grub-install under chroot only works once you have
access to /dev from the chroot environment).

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https://bugs.launchpad.net/bugs/1072880

Title:
  grub fails to install on dmraid during upgrade to 12.10

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