admins worst nightmare...

[dsr-mzpnVDyJpH4k7aNtvndDlA at public.gmane.org (Dan Ritter)]

On Mon, Mar 08, 2010 at 03:43:35PM -0500, Stephen Adler wrote:
> Guys,
> 
> I discovered that my 6 terabyte file does not seem to be working 
> properly... I did a copy of a gigabyte sized file to find that the 
> original and copied md5sum's to differ.... uggg.... I'm doing a 
> filesystem check right now, but I'm wondering if you guys have any 
> thoughts on what may be going on with the file system. It's an ext3 file 
> system mapped over a software raid 5 raid array. When I created the file 
> system, I used all the default mkfs parameters for a journaled file 
> system. (i.e. mkfs -J /dev/md127; where md127 is my raid device.)
> 
> When I checked a small file, several megabytes in size, the copy and 
> original had the same md5sum.
> 
> Is there a tool which will give you a summary of how different binary 
> files are? will diff work on a gigabyte sized file?

rdiff uses the rsync algorithms to figure out the differences
between two binary files.

Next time you need an exact copy, use rsync, even if it's local.
The switches you want include -v -c -p -o -g -t --partial and
probably -z.

-dsr-

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