Theo Band wrote:
On 09/13/10 17:48, Ernatalo su Gmail wrote:
i know that this is a good thing, but i've only 1 partition. /boot and /root are in the same partition that i convert from ext3 ti ext4. everything works fine until this morning. I "rebooted" the server many time from the "convertion" but i had never upgrade the Centos before today. with the update the trouble begun! from Installation DVD i can see the /dev/sbd1/ (hd0,0) and with fdisk -l i can see that it's an ext4 partition.
Nothing to worry if you can still mount the disk while booting from the DVD. From the grub shell you can also issue a find command (find /boot/grub/grub.conf). Perhaps the disk is mixed up and it is now hd1 and hd0 is you external drive?
(hd1,0)/boot/grub/grub.conf
If you start typing "(hd" and then use command completion, you will see which drives are seen by grub like hd0 or hd1 etc, and what partitions exist).
root(hd1) configfile /boot/grub/grub.conf will get you back to the boot menu. (It's all from my head, so mind some typos)
What he said. Also, note that filename completion is enabled in the grub shell, so if you type root (hd0,0) then try kernel /vm<tab> and don't get anything, try root (hd0,1) or 2, or root (hd1,0) etc, until you get a completion. At that point, you'll know what your root disk is (hd0, or 1, or whatever). Once you boot up and have a running system again, run $ grub-install /dev/<whateveryour/bootdrive is), like $grub-install /dev/sda
Quirk: regardless of what it is, /boot/grub/grub.conf seems to see the physical drive /boot is on as (hd0)... and don't confuse, say, /dev/sda1 with grub's (hd0,1): two different nomenclatures.
mark