Re: converting to raid - Error 2

["Timothy D. Lenz" <tlenz@vorgon.com>]

On 5/5/2010 9:25 AM, Doug Ledford wrote:
> On 04/30/2010 05:58 PM, Timothy D. Lenz wrote:
>>
>>
>> On 4/30/2010 1:53 PM, Doug Ledford wrote:
>
>>> You can't use the setup macro (can't remember why, I just know it
>>> generally doesn't work) when putting grub on your raid1 array.  You need:
>>>
>>> install --stage2=/grub/stage2 /grub/stage1 (hd0) /grub/e2fs_stage1_5
>>> /grub/stage2 /grub/grub.conf
>>>
>>> and if that doesn't work in your particular configuration, you can add
>>> the d option after stage1 and before (hd0), but if you use it, then your
>>> boot disk must always be BIOS device 0x80, which means setting your BIOS
>>> to boot off of some disk other than the first disk found usually won't
>>> work and instead you just have to make whatever disk you want to boot
>>> off of the first disk found by the BIOS.  You can switch (hd0) to
>>> (hd0,0) if you want and if you have a normal DOS master boot record.
>>>
>>>>    grub>device (hd0) /dev/sdb
>>>>    grub>root (hd0,0)
>>>>    grub>setup (hd0)
>>>>
>>>> To copy the current boot drive hda1 over to md0, I use a GRML boot disk,
>>>> mount /dev/md0 to /mnt/md0 and /dev/sdd1 (/dev/hda1) to /mnt/sdd1,
>>>> then do:
>>>>
>>>> rsync -caHh --progress --delete /mnt/sdd1/ /mnt/md0.
>>>>
>>>> Then I reboot normally. I have 2 copies of /boot/grub/device.map,
>>>> /boot/grub/menu.lst and /etc/fstab. one for normal boot and one for
>>>> raid. On /mnt/md0 I swap the normal boot files for the raid files by
>>>> adding .old to the names of normal boot and removing .raid from the raid
>>>> versions. Then reboot again and in cmos move the pata drive to the
>>>> bottom of the list so cmos tries the sata drives first. That worked for
>>>> the 32bit linux 2 drive system. But on this 64bit 3 drive I get:
>>>>
>>>> Grub loading stage 1.5
>>>> Grub loading, please wait
>>>> Error 2
>>>>
>>>> I can't remove the 3rd drive because it has part of md2 and I shouldn't
>>>> need to anyway. Copies of the above mentioned files I put at:
>>>> http://24.255.17.209:2400/vdr/local/raid/
>>
>> grrr, used reply instead of reply all again, sorry:
>>
>> I don't understand why using those commands at the grub>  prompt won't
>> work. It worked on the other computer.
>
> Can't answer that for you.  I didn't bother to work out *why* it didn't
> work, just that it's known to fail in some situations (the setup
> command).  Maybe it's because it pulls information from the device map
> and gets the device line wrong (and yes, the setup macro redoes whatever
> device line you put in based upon the information in the device map
> file).  Maybe it's something else.  Regardless, it's known to fail.
>
>> This is grub 1, not grub 2.
>
> Yes, my instructions were for grub1.
>
>> I
>> haven't updated it yet. It is using lenny. I did start the upgrade to
>> grub2 on the other computer a short time ago, but haven't yet done the
>> final command to finish the change. Trying to solve one thing at a time
>> and right now this is the oldest. I don't recall ever doing any install
>> --stage2=/grub/st.... on the other system.
>>
>> Here is what I get when I do this for sda:
>> ---------------------------------------
>> grub>  device (hd0) /dev/sda
>>
>> grub>  root (hd0,0)
>>   Filesystem type is ext2fs, partition type 0xfd
>>
>> grub>  setup (hd0)
>>   Checking if "/boot/grub/stage1" exists... yes
>>   Checking if "/boot/grub/stage2" exists... yes
>>   Checking if "/boot/grub/e2fs_stage1_5" exists... yes
>>   Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  15 sectors are
>> embedded.
>> succeeded
>>   Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p
>> (hd0,0)/boot/grub/stage2 /boot/grub/menu.l
>> st"... succeeded
>> Done.
>> ---------------------------------------
>
> I know, it looks fine.  But it screws it up anyway.  It isn't reliable.
>   You have to use the bare install command like I pointed out above.  You
> also need to make sure that your boot partitions on the two drives are
> *identical* in terms of placement on the drives (aka, the partitions
> need to occupy the same logical sector numbers on both drives, which is
> normal when they are both the first partition on each drive and the
> drives use the same sector/head counts per track which is typical now a
> days).
>
>> And I just noticed something.I used sda, not sda1. I can't remember
>> which I did before with the other, but my notes show sda. Would that
>> matter?
>
> Normally sda would be the one I would use, but sda1 would work as long
> as you have a normal DOS master boot record on the drive.
>

At this point I don't know if they are "normal DOS master boot record". 
I set the drives up a year ago or so. Here are the steps from my notes:
---------------------------------------
sudo fdisk /dev/sda
	Command (m for help): <-- n
	Command action
	   e   extended
	   p   primary partition (1-4)
	<-- p
	Partition number (1-4): <-- 1
	First cylinder (1-60801, default 1): <-- <ENTER>
	Using default value 1
	Last cylinder or +size or +sizeM or +sizeK (1-60801, default 60801): 
<-- +25000M
	Command (m for help): <-- t
	Selected partition 1
	Hex code (type L to list codes): <-- fd
	Changed system type of partition 1 to fd (Linux raid auto)
-------
	Command (m for help): <-- n
	Command action
	   e   extended
	   p   primary partition (1-4)
	<-- p
	Partition number (1-4): <-- 2
	First cylinder (3041-60801, default 3041): <-- <ENTER>
	Using default value 3041
	Last cylinder or +size or +sizeM or +sizeK (3041-60801, default 60801): 
<-- +5000M
	Command (m for help): <-- t
	Hex code (type L to list codes): <-- fd
	Changed system type of partition 1 to fd (Linux raid auto)
-------
	Command (m for help): <-- n
	Command action
	   e   extended
	   p   primary partition (1-4)
	<-- p
	Partition number (1-4): <-- 3
	First cylinder (3650-60801, default 3650): <-- <ENTER>
	Using default value 3041
	Last cylinder or +size or +sizeM or +sizeK (3650-60801, default 60801): 
<-- <ENTER>
	Command (m for help): <-- t
	Hex code (type L to list codes): <-- fd
	Changed system type of partition 1 to fd (Linux raid auto)
-------
Make partition 1 bootable
	Command (m for help): <-- a
-------
save and write to disk
	Command (m for help): <-- w
---------------------------------------

I was thinking making one more try, but ether using su instead of sudo 
or just logging in as root as some stuff doesn't seem to work with sudo. 
Need to find the time when I'm home long enough with no interruptions to 
try it:).

Before I try the manual install, do you know what the "1+15 p" is in the 
install line the auto system did?