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Date: Fri, 22 Dec 2006 17:33:06 -0600
From: Eric Sandeen <sandeen@sandeen.net>
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To: gbakos@cfa.harvard.edu
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Subject: Re: unexpected XFS SB magic number
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Gaspar Bakos wrote:
> Hi, Eric,
> 
> RE:
>>> xfs_check: unexpected XFS SB magic number 0x45464920
>> That spells "EFI"
> 
> Does this have any special meaning? E.g. I could figure out who
> labelled the disk (array)?

EFI is a bootloader....

>> looks like somebody came along & labeled your disk for you.  Dangers of
>> being on a san I suppose (if you are....)
> 
> Humm. This is an FC5 with SMP opteron. The RAID-5 (12 disks) is ran by
> an ARECA 1130-ML card.
> 
>> repair might fix it....
> 
> I worry that what repair will leave behind is pure numbers (and many of those), like
> 11212/
> 12133/
> 121212/
> ...
> and to reconstruct ~3Tb from that is not trivial...
> 
> This reminds me: what paranoid safety measures can one take? E.g keep
> an external log of the filesystem as well?
> 
> Thanks for the thoughts!
> 
> Gaspar
>