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Unexpected XFS SB number 0x00000000

To: linux-xfs@xxxxxxxxxxx, xfs@xxxxxxxxxxx
Subject: Unexpected XFS SB number 0x00000000
From: Martin Eisenhardt <martin.eisenhardt@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 26 Apr 2007 21:46:55 +0200
Organization: Otto-Friedrich-Universität Bamberg
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Hello list(s),

I run XFS on a software raid on Linux 2.6.19. When I invoke xfs_db in 
read-only mode, I get:

# xfs_db -r /dev/md0
xfs_db: unexpected XFS SB magic number 0x00000000
xfs_db: read failed: Invalid argument
xfs_db: data size check failed
Segmentation fault

The system is still running, the filesystem seems to be fine (except for the 
above): files are created, written, and deleted without any problem.

So, I have two questions:

* Is there a real problem, or might a quick reboot solve this?
* If there is a real problem with the file system: What steps do you recommend 
to overcome this problem?
* How safe is it to run xfs_check and xfs_repair?

Thanks in advance!

Kind regards
Martin Eisenhardt

P.S.: Sorry for cross-posting, I just figure that maybe the XFS users on 
non-linux systems might have a hint or two for me ... ;-)

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