Re: grub fails to boot, prints only a single dot

[Andrei Borzenkov]

В Tue, 09 Jun 2015 12:19:49 -0400
Alex Regan <address@hidden> пишет:

> Hi,
> 
> >> How do I capture that output?
> >
> > I'm afraid only by making a photo of screen where it stops.
> 
> Okay, I will try and do this.
> 
> > For a test you could split /boot and leave it on physical disk just to
> > check whether GRUB can boot in this case (I expect it can). This could
> > give you workaround - you still can manually copy kernels and updatre
> > grub on second disk.
> 
> Okay, do you mean to mount one of the RAID1 members to /boot directly 
> and run grub2-install, correct?
> 

Depending on metadata version mounting RAID member directly may not be
possible.

> Or copy the contents of /boot, format an individual partition, mount it 
> on /boot, copy the data back, and run grub2-install?
> 

Yes. It makes sense to wipe out metadata to be sure (mdadm
--zero-superblock)