VirtualBox and LVM

I'm running RHEL6 in a VirtualBox.

Any time I start RHEL, I get a Kernel Panic - not syncing: Attempted to kill init!...

If I restart RHEL, and append "rdshell" to the startup line, it will drop me to a dracut shell. I then issue the following commands:

# lvm vgscan
# lvm vgchange -ay
# blkid (I doubt that one is really necessary)
# exit

The system will then finish starting fine.

Why do I have to do that every time? Any way to avoid having to do this?

Thanks.