Hard drive weirdness.

[David Gibb]

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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