On 17.10.2011 22:05, Phillip Susi wrote:
> When running update-grub, I get several lines of:
>
> error: unknown LVM metadata header.
>
While this message is verbose, it doesn't actually prevent GRUB from
working and you report refers to no other problem
> This appears to be caused by grub-probe locating the LVM PV label sector
> on the underlying physical disk ( hd3,msdos1 ), and incorrectly
> following the pointer to the mda header.  At this point, it has already
> scanned the 4 physical disks, found the first partition on them, found
> the mdadm 1.0 superblock, and correctly located the LVM PV label sector
> inside (md/0).  The first few sectors of (md/0) ( 4 disk raid-5 array
> ) are aliased to (hd3,msdos1), but obviously the offsets are wrong
> since they are relative to the md array, not the disk partition.
>
> My first thought was that once the mdadm superblock is found on the
> partition, that should take ownership of it and prevent scanning for
> LVM, but theoretically it is possible to have mdadm inside LVM instead
> of the other way around, and that would no longer work if you didn't
> scan for both.
>
> Any ideas on what could be done to get rid of this error?
>
>
>
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>


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko