[NTLUG:Discuss] CentOS 4.4 wont boot - how do I restoreboot sequence?

[joseph beasley]

At the grub prompt:

root (hd0,0)
setup (hd0)
quit


Assuming the first partition on the first disk. If you use the second
partition, use hd0,1.


--- Leroy Tennison <leroy_tennison at prodigy.net> wrote:

> Neil Aggarwal wrote:
> > John:
> >
> > When I boot into rescue mode, I can get into grub.
> >
> > When I type any of these commands:
> > 	root (hd0,0)
> > 	root (hd0,1)
> > 	root (hd0,2)
> > 	root (hd0,3)
> >
> > I get this output:
> > 	Filesystem type is ext2fs, partition type 0xfd
> >
> > When I type:
> > 	install (hd0)
> >
> > I get this output:
> > 	Error 1: Filename must be either an absolute pathname
> > 		or blocklist
> >
> > Any ideas what I need to do?
> >
> > Thanks
> > 	Neil
> >
> > --
> > Neil Aggarwal, (832)245-7314, www.JAMMConsulting.com
> > FREE! Eliminate junk email and reclaim your inbox.
> > Visit http://www.spammilter.com for details.
> > -----Original Message-----
> > From: discuss-bounces at ntlug.org [mailto:discuss-bounces at ntlug.org]
> On Behalf
> > Of John K. Taber
> > Sent: Thursday, May 03, 2007 2:42 PM
> > To: NTLUG Discussion List
> > Subject: Re: [NTLUG:Discuss] CentOS 4.4 wont boot - how do I
> restoreboot
> > sequence?
> >
> > I don't know anything about CentOS, but maybe your problem is
> similar to
> > what I had. It sounds like your machine cannot find the MBR.
> >
> > Try reinstalling grub from a Linux rescue command line, if you have
> a
> > bootable CD or diskette. You might have to change the boot sequence
> in
> > BIOS first.
> >
> > On the rescue command line, enter "grub". If that gives you the
> grub
> > command line, then try to find the boot partition by entering the
> grub
> > command:
> >
> > root (hd0,1)
> > or
> > root (hd0,2)
> > or ... experiment
> >
> > grub will report when it recognizes a partition, hopefully the one
> with
> > the MBR. Otherwise, grub reports "Unknown partition type" or some
> such
> > message. Note that grub knows nothing about sdn's, only hdn's
> regardless
> > of type of hard drive.
> >
> > Then install grub again:
> >
> > install (hd0)
> >
> > Finally, quit grub with "quit", and exit the rescue command line
> with
> > "exit", and restart your machine.
> >
> > On Thu, 2007-05-03 at 13:40 -0500, Neil Aggarwal wrote:
> >   
> >> Robert:
> >>
> >> It does not get to grub.
> >>
> >> The machine gets to the bios checking for a bootable CD
> >> and then stops.
> >>
> >> I checked the bios and the drives are there.  They are SATA
> >> drives.  I can see the data when I boot the LiveCD and mount
> >> /dev/md0, /dev/md1, and /dev/md3
> >>
> >> Any ideas?
> >>
> >> Thanks,
> >> 	Neil 
> >>
> >> --
> >> Neil Aggarwal, (832)245-7314, www.JAMMConsulting.com
> >> FREE! Eliminate junk email and reclaim your inbox.
> >> Visit http://www.spammilter.com for details.
> >>
> >> -----Original Message-----
> >> From: discuss-bounces at ntlug.org [mailto:discuss-bounces at ntlug.org]
> On
> >>     
> > Behalf
> >   
> >> Of Robert Citek
> >> Sent: Thursday, May 03, 2007 12:39 PM
> >> To: NTLUG Discussion List
> >> Subject: Re: [NTLUG:Discuss] CentOS 4.4 wont boot - how do I
> restore boot
> >> sequence?
> >>
> >> Neil Aggarwal wrote:
> >>     
> >>> I have a CentOS 4.4 system that wont boot after the 
> >>> storms from last night since they knocked out the power.
> >>>       
> >> When grub shows up at boot, add '-b 1' to the kernel line.  How
> far do
> >> you get in the boot process?
> >>
> >> Regards,
> >> - Robert
> >>
> >>
> >> _______________________________________________
> >> http://www.ntlug.org/mailman/listinfo/discuss
> >>
> >>
> >> _______________________________________________
> >> http://www.ntlug.org/mailman/listinfo/discuss
> >>     
> >
> >
> > _______________________________________________
> > http://www.ntlug.org/mailman/listinfo/discuss
> >
> >
> > _______________________________________________
> > http://www.ntlug.org/mailman/listinfo/discuss
> >
> >   
> Before going any further, do you have a backup of the data you
> want/need 
> to preserve?  If not that's your very next step.  Doing fdisk
> /dev/hda 
> on my PC followed by 'l' (the single letter without quotes) shows
> that 
> 0xfd is "Linux raid auto".  Do you know how you originally set up 
> CentOS?  I'm wondering if this is LVM but I haven't done anything
> with 
> it so I could be way off. 
> 
> The command you probably want to install grub is grub-install, not 
> install.  However, before you use that and risk permanently damaging 
> things beyond recovery, get a backup.  I don't know that doing 
> grub-install would damage things but I'd hate to see you find out the
> 
> hard way.  I did find some articles Googling for grub and LVM but, 
> without knowing that you are actually using LVM, this is an exercise
> in 
> speculation.
> 
> 
> 
> _______________________________________________
> http://www.ntlug.org/mailman/listinfo/discuss
> 


Joe Beasley
CNE, CCNP, MCSE, CCNA, AEIOU....

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