[CentOS] CentOS 7 1708 won't boot after grub2 update

> > Edit the grub line to boot into single user and remove "rhgb" and
> > "quiet" so you can see all the messages. See where it stops.
> > 
> > I've seen issues recently with Intel chipset and RAID - a couple of my
> > machines have paused for a very long time after booting and before
> > presenting login screens/prompts. It looks as if checking the array
> > after a non-clean shutdown is sucking so much CPU time that nothing
> > else happens. (The secondary issue is why it's shutting down without
> > marking the array as clean!)
> 
> Thanks!
> 
> You use xfs on these machines?
> 
Yes. 

P.