Cannot boot from software RAID with 2TB disks

[Tom H]

On Wed, May 12, 2010 at 8:51 PM, Christopher Chan
<christopher.chan at bradbury.edu.hk> wrote:
> On Thursday, May 13, 2010 05:09 AM, Tom H wrote:
>> On Wed, May 12, 2010 at 3:21 PM, Brian McKee<brian.mckee at gmail.com>  wrote:
>>> On Wed, May 12, 2010 at 7:55 AM, Matthias Brennwald
>>> <matthias at brennwald.org>  wrote:
>>>> On May 12, 2010, at 9:58 AM, ubuntu-users-request at lists.ubuntu.com wrote:
>>>>>> What are my options? I'd appreciate any hints and help on how I can make this install work.
>>>>> Only one. Destroy and redo it. 2 disks mirrored for system and the other
>>>>> three a raid5 to be used however you like.
>>>> I just tried to install Ubuntu 10.04 onto a RAID1 with two disks. Same result. I still believe my problem is related to this:
>>>> https://bugs.launchpad.net/ubuntu/+source/partman-base/+bug/506670
>>>
>>> Said bug (and I *think* the instructions you pointed to earlier) both
>>> refer to grub.
>>> Lucid uses Grub2 doesn't it?  I suspect your instructions are out of date.
>>
>> I suspect that in the instructions on
>> https://help.ubuntu.com/community/Installation/SoftwareRAID
>> grub refers to grub2 because that is/was the 9.10 default for a clean
>> install. Anyway, grub1 doesn't do RAID.
>
> grub1 does not need to 'do' raid. grub1 has been used for mirrored /boot
> or / for a very long time now.

If you say so, although we have always used hardware RAID for /boot
everywhere that I have worked, in some places, openly, because it was
said that grub1 could not handle RAID. I have even insisted on
hardware RAID when moonlighting... Oops! I will have to review my
purchasing recommendations when installing Lenny or CentOS.


>> The help should probably put the warning about RAID1 and /boot at the
>> very top where it says:
>> "How to create RAID using Ubuntu Software RAID. Including RAID 0, 1, 5 and 6."
>
> Nope. There should be a separate page for installing on raid and that
> page should only deal with creating RAID devices. Confusion gone.

Agreed. But also on this page; or at least remove the boot-loader
section from this page.