On 11/18/2009 11:34 AM, Mr. Teo En Ming (Zhang Enming) wrote:
On Thu, Nov 19, 2009 at 3:06 AM, Rick Stevens<ricks@xxxxxxxx> wrote:
On 11/18/2009 10:33 AM, Mr. Teo En Ming (Zhang Enming) wrote:
Hi All,
After restoring data from a backup image set for a 500GB harddisk to a
1000 GB harddisk, I am unable to boot up my F11 OS. I have already
restored *both* the MBR backup and the dump output from sfdisk.
What else is missing? I am stuck at a blinking cursor at the top left
corner of the screen. GRUB is not loading and I am unable to select
any kernel to boot.
Using System Rescue CD, I am able to activate all the logical volumes
and all the volume groups that were restored. I am also able to mount
all the logical volumes and access the restored filesystems.
So I think the filesystems are restored properly. So I think it is the
problem with MBR, sfdisk dump output restoration, or GRUB. Is there a
problem with restoring data of a 500 GB harddisk to a 1 TB harddisk?
Well, let's see...the geometry between the two disks are going to be
different so the partition table's going to be screwed up. That may
cause an issue with grub. It's always dangerous to use block-level
backups and restores when the drives are of different sizes or geometries.
I'd recommend you boot off the DVD in rescue mode, then use fdisk and
the other tools to verify that the partition tables are in good shape.
You should also probably fsck each filesystem just to make sure. Once
all that's done, you may have to rebuild the grub environment:
chroot /mnt/sysimage
grub-install /dev/sda (or whichever disk it is)
exit (gets out of the chroot)
exit (gets out of the rescue boot)
Pop the DVD out and try to boot again. That may fix it.
Hi,
If I want to use grub-install, I have to mount the partitions on the
restore harddisk and then chroot into the mount?
Yes, that's correct. When the rescue boot comes up and asks if you
want the filesystems mounted, answer "yes".
Because earlier I have used the interactive grub prompt method without
mounting filesystems on the restore harddisk and chrooting.
That works too. Some people get freaked out by the terminology used
by grub in interactive mode, so I tell them to use the method I
mentioned. It's a bit less intimidating to the newbie.
You aren't one of those people and you seem to have solved it, so
congratulations! Well done!
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer ricks@xxxxxxxx -
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- I doubt, therefore I might be. -
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