Re: Raid failing, which command to remove the bad drive?

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On Sat Sep 03, 2011 at 04:35:39 -0700, Simon Matthews wrote:

> On Fri, Sep 2, 2011 at 8:42 AM, Timothy D. Lenz <tlenz@xxxxxxxxxx> wrote:
> >
> >>
> >> How did you install Grub on the second drive? I have seen some
> >> instructions on the web that would not allow the system to boot if the
> >> first drive failed or was removed.
> >>
> >
> >
> > I think this is how I did it, at least it is what I had in my notes:
> >
> > grub-install /dev/sda && grub-install /dev/sdb
> >
> > And this is from my notes also. It was from an IRC chat. Don't know if it
> > was the raid channel or the grub channel:
> >
> > [14:02] <Jordan_U> Vorg: No. First, what is the output of grub-install
> > --version?
> > [14:02] <Vorg>  (GNU GRUB 1.98~20100115-1)
> > [14:04] <Jordan_U> Vorg: Ok, then run "grub-install /dev/sda && grub-install
> > /dev/sdb" (where sda and sdb are the members of the array)
> >
> 
> Which is exactly my point. You installed grub on /dev/sdb such that it
> would  boot off /dev/sdb. But if /dev/sda has failed, on reboot, the
> hard drive that was /dev/sdb is now /dev/sda, but Grub is still
> looking for its files on the non-existent /dev/sdb.
> 
The way I do it is to run grub, then for each drive do:
    device (hd0) /dev/sdX
    root (hd0,0)
    setup (hd0)

That should set up each drive to boot up as the first drive.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@xxxxxxxxxxxxxxx> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

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