[CentOS] CentOS 6.2 on partitionable mdadm RAID1 (md_d0) - kernel panic with either disk not present

[Rob Kampen]

On 06/20/2012 07:23 AM, Arun Khan wrote:
> On Wed, Jun 20, 2012 at 12:11 AM,<m.roth at 5-cent.us>  wrote:
>> Arun Khan wrote:
>>>     Device Boot      Start         End      Blocks   Id  System
>>> /dev/sda1   *           1         523     4194304   83  Linux
>>> Partition 1 does not end on cylinder boundary.
>>> /dev/sda2             523        1045     4194304   83  Linux
>>> /dev/sda3            1045        1176     1048576   82  Linux swap /
>>> Solaris
raid needs Id of fd rather than 83 to auto detect??
>> <snip>
>> Ok, I see that it's hardware 512b blocks, so you're not running into
>> issues with 4k hardware blocks. I trust you installed grub on /dev/md0,
>> which I assume is /dev/sda1 and /dev/sdb1?
>>
> > From the wiki instructions, there is no re-installation of GRUB, only
> a couple of changes in /boot/grub/grub.conf file installed by the
> regular installation on /dev/sda.   During the RAID1 creation process
> the  grub from /dev/sda would mirrored into the RAID1 device and
> appear on the MBR of both the disks.
>
> As I said in the OP, I do see the grub menu with either of the disks
> "unplugged"  i.e. missing.   The kernel does boot and the white
> progress bar goes upto about 50% when the kernel panic occurs.  I will
> turn off the splash and see what comes up on the console.   Gut
> feeling --  I suspect the problem is with the initrd image created
> with the "dracut"
>
> -- Arun Khan
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