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SubjectNFS corruption (duplicated data)
I really don't understand what could be causing this, but it happens on
several machine and at least on kernels 2.4.22, 2.4.25, 2.4.26.
NFS v3 : hard, udp, rsize=8192,wsize=8192
local filesystems are XFS

Trond, this is data corruption not dropped packets so the protocol
being UDP is not the problem.

Here is what is happening :

Copying a file of offsets from machine A to machine B over NFS and then
comparing the file on B with the file on A over NFS, the file on machine B
is corrupted in the following ways.

Usually, data earlier in the file will show up again later.
For example :

57344 bytes of data from 672190464-672247807 is also in positions

sometimes, data later in the file is dupped to a position before it
should be

53248 bytes of data from 1197158400-1197211647 is also in positions

Any ideas

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