Re: Raid5 regression

[Phillip Susi]

Wasn't there a change made recently to support the new md metadata 
formats?  I wonder if that is causing grub to detect the raid superblock 
both at the end of the physical disk, as well as within the partition, 
causing it to see the members twice?

On 5/3/2011 10:33 AM, Phillip Susi wrote:
> After upgrading an Ubuntu server from Maverick to Natty ( grub2 version
> 1.99-rc1-13ubuntu3 ) the system no longer will boot. Grub complains
> about the raid5 array:
>
> error: Found two disks with the index 0 for RAID md0
> error: Found two disks with the index 1 for RAID md0
> error: Found two disks with the index 2 for RAID md0
> error: Superfluous RAID member (4 found)
> error: Unknown filesystem
>
> This is a 4 disk raid5 array that mdadm still recognizes and looks fine,
> with each disk having IDs 0 through 3 respectively. Despite the fact
> that it complains about the raid, it still shows the LVM logical volumes
> in the output of ls. The array is the sole LVM PV.
>
> Bug filed at https://launchpad.net/bugs/776422. Any hints on how to
> proceed with debugging this? Is there a way to check what modules are
> built into the core image from the rescue shell?