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SubjectRe: Data corruption
paul wrote:
> Since 2-3 month I have some random data corruption on my Linux server, after
> checking disks independently (i'm using raid1on 2 sata disk, the problem is
> the same w/o raid) and memory, hardware simce to be out of cause...
>
> Here is my problem:
> => head --bytes=300m /dev/urandom > test
> => for i in `seq 0 9` ; do cp test test$i ; done
> => md5sum test*
> I got :
> 014666c728c9e3b8299579fae499864a test
> 014666c728c9e3b8299579fae499864a test0
> 333fd93d093ac612cd8d5f65628f734e test1
> 1ab6ee68c6a7d9ff5a05f9d63f0f6df6 test2
> 96e96483e3175a59c9c05b6720514e1e test3
> 014666c728c9e3b8299579fae499864a test4
> b24dbccc9f4831f8825ab4a55a3be4aa test5
> 8493efc9c14e4b5c162ac23696fbc16a test6
> 6a5f4301f66d0379049d79d0e14e2a87 test7
> 2c81cfa1c3a03aba134574922ee5d75c test8
> 2ea15c8392bfd0123472a80125bb3abe test9
>
> ^^^ that sounds really bad for my data :(

It does indeed. Can you try comparing the data to see precisely how much
differs between the versions? md5sums don't distinguish between a single-bit
error and a block or page-sized error, but the distinction is critical in
determining what broke.

Can you reproduce this on a recent upstream baremetal (non-Xen) kernel? If so,
does it go away when you boot with mem=3000M?

-- Chris
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