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Re: RAID1 does not boot



On Thu, Apr 5, 2012 at 6:25 PM, Camaleón <noelamac@gmail.com> wrote:
> On Thu, 05 Apr 2012 17:09:53 +0500, Muhammad Yousuf Khan wrote:
>
> (please, keep a bottom posting style, it reads better)
>
>> On Thu, Apr 5, 2012 at 4:37 PM, Camaleón <noelamac@gmail.com> wrote:
>
> (...)
>
>>> My guess is that the problem here is booting from the raid volume.
>
>> Thanks, i found out the problem but still i am confused actually i have
>> disk 1 and disk 2  with same specs like they both are 320 GB and same
>> made. here is my partition flow (because i had tried installation so
>> many times so i change the partition structure)
>>
>> 1. /Boot 1GB (Boot on and on RAID /dev/md0)
>> 2. SWAP 4 GB (RAID /dev/md1)
>> 3, / (remaining space) (RAID /dev/md2)
>
> So basically you have now included /boot and /swap into the RAID, right?
YES both are raid volumes
>
>> now at the end after installation when system rebooted for the first
>> time i receive "error loading operating system" actually in BIOS boot
>> option i mistakenly selected SATA2 as boot instead of SATA 1. when i
>> shift things back i manage to reach grub menu.
>
> Okay, so now you get to GRUB's menu and then, what happens? Can you
> finally boot your installed system?
>

Yes. i can work normally as i boot from the grub menu.  there is no
problem at all. every thing is quite normal even here is the result of
"cat /proc/mdadm

Personalities : [raid1]
md2 : active raid1 sda3[0] sdb3[1]
      307588416 blocks [2/2] [UU]

md1 : active (auto-read-only) raid1 sda2[0] sdb2[1]
      3903680 blocks [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[1]
      1076224 blocks [2/2] [UU]


>> now the part where i am confuse is that i believed that the computer
>> should have booted from SATA2 as well  because boot partition is also
>> installed over it too.
>
> (...)
>
> Mmm, IIRC software RAID (mdadm) needs from user intervention (manual
> tweaking) when one of the disks goes offline (or you alter the disk order
> at the BIOS ;-) ), at least for booting. I mean, you had to install GRUB
> in both disks or something like that, I dont't remember the exact steps
> but they should be documented...
>
> Greetings,
>
> --
> Camaleón
>
>
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