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[Solved]How to change the boot order between 2 HDD?
Here is my situation:
I have debian etch installed on the machine. It is my webserver. I took a another hard drive (250GB) from another machine which has debian etch installed on it. It contains no data. I put this 250gb hardrive on my webserver machine thinking that i can use it at as a backup. when i booted the system it boots the debian from 250gb harddrive and not the other harddrive(40GB).
Here is what i want to do:
1. The machine should boot up from 40GB HDD.
2. I want to remove debian from the 250GB HDD. Format it and mount it and just use it as a backup for the 40GB HDD.
An interesting setup. Personally, when originally setting up the machine I would have made the 40GB drive Primary IDE master, and the cdrom Secondary IDE master, purely for speed as the IDE interface runs at the speed of the slowest device on it, and cdroms tend to be slower than hard drives.
If your BIOS is not giving you an option to choose between the two hard drives for booting, the only option really is to change the order of the drives on the IDE interfaces. I would put the 40 Gb as Primary IDE master. However this might mean changing the grub configuration.
If the set up is like:
primary IDE master - cdrom
Primary IDE slave - 40GB
secondary IDE master - 250GB
I get the grub error. Grub stage 1.5 Grub loading.....error 15
If my set up is like:
primary IDE master - cdrom
Primary IDE slave - 250GB
secondary IDE master - 40GB
The system tries to boot from 250GB hdd. When it tries to look at the /root files it just stays...since there are no files on the 250GB hdd.
Onething i noticed is that when i tried to start the machine with one hdd (40GB) connected. It gets the device name as hdc and boots without any problem. When I start the machine with 2 hdd connected. The dev name becomes hdb for 40GB and hdc for 250GB.
This is what is happenning to my system. what do i need to do if i want to boot my system from 40GB hdd? plz advice.
Going back to your origional post. Surely all you had to do was change /boot/grub/menu.lst so that root is on the hd you want.
So if grub thinks that the 250G thing is hd0 as it apparently did then change menu.lst on this drive so that root is hd1,whateverPartition also change the message that it sends to the kernel on the end of the kernel line is it? to: hdb or sdb or whatever.
Looking at your last post. Grub's trying to boot from the 250G? Suggest you put a small /boot partion on this drive with /boot/grub/menu.lst. Then this is the file grub'll use presumably.
If it's trying to boot from 40G then this unnecessary.
In the menu.lst file that grub is using make root apply to 40G, hd0 or hd1 I can't work it out, and at the end of the ?kernel line put the /dev for the 40G.
Grub may well have a different idea of the first hard drive than does the opperating system.
But simplest thing is just trial and error. Change hd0 and /dev/hdc1 (where c come from? If two hd should be hda and hdb) till it works. 'e' to edit line in grub file when grub puts up its splash screen; b to attempt to boot.
Last edited by lugoteehalt; 10-14-2008 at 12:32 PM.
Reason: Powerful surgings in the groin
[/sbin/fsck.ext3(1)--/var] fsck.ext3 -a -C0 /dev/hdc6
fsck.ext3:no such file or directory while trying to open /dev/hdc6
The Superblock could not be read or does not describe a correct ext2 filesystem.......
and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
fsck died with exit status 8
file system check failed
Control-D will terminate this shell and resume system boot.