Hello!

I have 2 boxes with SL6 x86_64, after some updates, I'm get a similar bug https://bugzilla.redhat.com/show_bug.cgi?id=772926, http://rhn.redhat.com/errata/RHBA-2012-0839.html
Okay, in SL6.3 dracut version is dracut-004-283.el6 (maybe with this bugfix), but:
- my mdraid is works fine (not degraded) http://fpaste.org/uWe6/ (boot from md0);
- successfully boot with old kernel-2.6.32-220.4.1.el6.x86_64 (it seems from SL 6.1).

As it is written in the comments from Red Hat's bugzilla, runs with "rdshell" in kernel option I can't seen /dev/disk/by-uuid/ directory (/dev/disk/by-id/ and /dev/disk/by-path/ is present).