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Old 02-09-2005, 05:37 PM   #1
pmrent
LQ Newbie
 
Registered: May 2004
Location: Green Bay, WI
Distribution: RH 9 RHE 2.1 3.0
Posts: 27

Rep: Reputation: 15
Can't Boot Grub Prompt


I used a windows boot disk and image client 32 to create an image back up of my linux RHE3 ES. I was restoring the back up to another server and all I get is the grub prompt. I'm assuming I corrupted the mbr.

How do I fix this?

Install the Redhat enterprise linux 3 es install disk #1 and type in linux rescue

Then what?

thanks in advance for your help.

-pete
 
Old 02-09-2005, 09:07 PM   #2
bulliver
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Registered: Nov 2002
Location: Edmonton AB, Canada
Distribution: Gentoo x86_64; Gentoo PPC; FreeBSD; OS X 10.9.4
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If you have a grub prompt then you can boot your kernel manually. And I would say it is much more likely you have a malformed or missing grub.conf file rather than any corrupted mbr.

Assuming your kernel is in a /boot partition on /dev/hda1 you would do this:
Code:
grub> root (hd0,0)
  Filesystem type is ext2fs, partition type 0x83
grub> kernel (hd0,0)/mykernel root=/dev/hda2 vga=791
  [Linux-bzImage, setup=0xa00, size=0x10b949]
grub> boot
....starts booting....
Remember that grub prompt has tab completion, so if you don't remember your kernel name:
Code:
grub> kernel(hd0,0)/[Tab]
   Possible files are: mykernel myotherkernel etc.....
Once you are booted fix your grub conf.
 
Old 02-15-2005, 05:58 AM   #3
pmrent
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Registered: May 2004
Location: Green Bay, WI
Distribution: RH 9 RHE 2.1 3.0
Posts: 27

Original Poster
Rep: Reputation: 15
Talking

Thanks for your help. I ended up rebuilding from scratch. After some more research symantix has problems with restores to different disk configurations. The image was taken from a 12 gig EMC disk partition and moved to a 8 gig Shark disk partition. I don't completely understand why this is an issue but it was in the knowledge base.

I have copied your idea into my personal faq database for future reference. I think manually booting is a good idea and I would like to try it anyways.

When I screw that up I'll reply back again.

Thanks

-pete
 
Old 02-24-2005, 01:11 AM   #4
aus9
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Registered: Oct 2003
Distribution: MX
Posts: 5,132

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my 2 cents worth.

when you do restores......you overwrite an existing partition so there is no need to overwrite the mbr.

pretending you had however, made larger patitions on machine 2 and were using images from machine 1 to restore machine 2
in the very worse scenario you may have to just redo grub in mbr to reset the correct block address for its booting files.

but if you always have /boot as the first partition and size is same for machine 1 to 2 imo grub in mbr is safe as is

btw I use www.partimge.org but off a knoppix cd
 
  


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