I don't want to hi-jack this but I may have a clew for you. I am
troubleshooting a similar problem and have found a trail. I recently installed
centos7 on my (improperly complicated system) and sometimes it will boot and
sometimes not. My problem is apparently caused by having three hard drives .
From boot to boot they get mounted in different orders. The drive with my os7
sometimes is mounted as/dev/sda and sometimes /dev/sdc. In grub.cfg on the os7
partition there is a statement "set root=hd0, msdos3" I think that may be the
villain but I don't know where it comes from. (The kernel lines use blockid's,)
That statement is in centos7, but not in centos6 where I have not had the
problem. I intend to search a while, and maybe learn something or take out a
couple of drives.Hopefully this helps.
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