asr: Invalid magic number in RAID table; saw 0x0, expected 0x900765C4 on sdb
Darrick J. Wong
djwong at us.ibm.com
Tue May 29 23:13:59 UTC 2007
On Tue, May 29, 2007 at 05:23:05PM -0400, David Rice wrote:
> I am trying to help a user who is getting the above error message. Can
> someone take a look at this?
> http://ubuntuforums.org/showthread.php?t=456042
>
> They have posted a dump of the metadata in the forums as well as various
> commands.
The message indicates that the asr (Adaptec HostRAID) driver in dmraid
can't find a HostRAID RAID header on the disk. This is a benign error
during RAID device discovery, though I concede that the error message is
not clear about that. In any case, the user's machine uses
/dev/mapper/isw_blahblahblah, which indicates that his system is really
using Intel Software RAID, so the error message is not what's causing
his problem.
(I believe the follow-up postings on that URL about dm locking down the
disk partitions being the reason why he can't mount /dev/sdXY are
correct, though I don't use bleeding-edge Ubuntus. :))
--D
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