Re: issue with mdadm and mirroring drives
thanks for the reply -
1. my issue is that i am not getting to the grub menu on the good
disk, it always goes to the bad one.
I think it puts me in a intrdfsram prompt or something similar - even
if i change the bios settings.
- so editing the grub menu option - is unavailable for me.
2. regarding the procedure after grub - you wrote:
grub-install --recheck --no-floppy /dev/sda
repeat for "/dev/sdb", or use "hd0" and "hd1" which is grub traditional
notation for first and second drives.
my drives are /dev/sda and my boot partition is /dev/sda1
what do i type in that scenerio after i am able to create the mirror
back to the way it was.
thanks
mjh
On Wed, Jan 18, 2012 at 12:49 PM, tv.debian@googlemail.com
<tv.debian@googlemail.com> wrote:
> 18/01/2012 18:03, Joey L wrote:
>> The issue I am having is that if I put into the system both drives,
>> the system always chooses the faulty drive.
>> I do not even get linux system - i get a weird text prompt - i think
>> it is initrdfs - even if i change it in the bios.
>>
>> On installing grub - can you tell me what is the procedure for that
>> after i get my drives to an okay state ?
>>
>> thanks
>> mjh
>
> To get the system to start on a degraded raid array you can try passing
> the following option on the "linux" line of the grub menu:
>
> md-mod.start_dirty_degraded=1
>
> To edit the grub menu entry type the letter "e", then make the changes
> by adding the option at the end of the line that starts with "linux".
> To boot use "ctrl" + "x" (keys "control" and "x" et the same time).
>
> Once you are in the system, issue (as root) the following commands
> assuming that "md0" is the array, and "sdb1" the faulty drive partition:
>
> mdadm /dev/md0 --fail /dev/sdb1
>
> mdadm /dev/md0 --remove /dev/sdb1
>
> mdadm /dev/md0 --zero-superblock /dev/sdb1
>
> mdadm /dev/md0 --add /dev/sdb1
>
> "fail" and "remove" can be issued in the same command, but you can also
> use them as shown above for clarity's sake.
>
>
> Regarding grub, just use the usual magic formula (as root):
>
> grub-install --recheck --no-floppy /dev/sda
>
> repeat for "/dev/sdb", or use "hd0" and "hd1" which is grub traditional
> notation for first and second drives.
>
>
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