Comment # 7 on bug 1205261 from Felix Miata

I still do not understand why failure to find a filesystem that won't be needed
before switchroot is complete at the earliest can hang a boot in a dracut
emergency shell. The non-intuitive extra complication restoring from backups or
migrating disks is why I reported this. Yes, the workaround works, but why is
it needed for boot to continue? Same question re root filesystem, since by
default and tradition every bootloader stanza contains root= that overrides
root= in initrd. Logic tells me these two dracut elements should be
complementary fallbacks, not mandatory. It seems like otherwise rd.hostonly=0
should be included on every Grub linu line that contains root=.