Hard drive weirdness.

David Gibb degibb at gmail.com
Wed Jul 23 15:32:06 UTC 2008


find /boot/grub/stage1
yields:
(hd2,0)

So, just to be clear,  should I now do:

device (hd0) /dev/sdc
root (hd0,0)
setup (hd0)
quit

?

Sorry to be cowardly about this, I just don't want to make things worse ;-)

David



On Wed, Jul 23, 2008 at 11:18 AM, David Gibb <degibb at gmail.com> wrote:
> Wow guys. Thanks for all the input. I'll give your suggestions a shot,
> and report back when I get some results.
>
> David
>
> On Wed, Jul 23, 2008 at 10:51 AM, Rashkae <ubuntu at tigershaunt.com> wrote:
>> David Vincent wrote:
>>> David Gibb wrote:
>>>> When I pulled sata drive #1, I get a blank screen with a blinking
>>>> cursor. No GRUB, no nothing. When I pulled sata drive #2, I get "GRUB
>>>> Hard disk error". When I pull both disks, I get a "System disk not
>>>> found" error.
>>>
>>>> I guess my questions are as follows:
>>>
>>>> 1) Does anyone know why my PATA drive isn't showing up as /dev/hda?
>>>> 2) I guess I could possibly explain the "GRUB Hard disk error" if the
>>>> absence of a drive caused the drive number to change, but I don't know
>>>> why the absence of the other drive causes a blank screen.
>>>> 3) Any idea how I should tinker with this system so that I can still
>>>> boot it in case one of the raid drives fails?
>>>
>>> my guess is your grub is installed to sata drive #1 (/dev/sda) and your
>>> sata disk #2 (/dev/sdb) is not set to bootable.
>>>
>>> someone please correct me if this seems too convoluted.
>>>
>>> 1.  you want to install grub to your /dev/sdc so when both disks fail
>>> grub can still find your stage1 and boot ubuntu.
>>>
>>> boot into ubuntu, open a terminal, type these commands:
>>>
>>> sudo grub
>>> find /boot/grub/stage1  (pay attention to the output here)
>>> root (hd0,2)  (i'm guessing that is the output from above, if not use
>>> what grub spat out)
>>> setup (hd0,2)
>>> quit
>>>
>>
>> Actually, yeah, this method is probably easier to get things fixed than
>> my suggestion.  Only difference is, sdc will not be device 0, but you
>> need it to be so.
>>
>> Therefore, between the find and root commands, add this one:
>>
>> device (hd0) /dev/sdc
>>
>> when you run the root command, make the device number 0, as above, but
>> the partition number (the one after the coma) should be the same as
>> reported by find.
>>
>> Also, you don't want setup (hd0,2), but rather setup (hd0)  (you want to
>> install grub in the master boot record of hard drive 0, not any partition.)
>>
>>
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>




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