NFS data corruption while scp a file on a remote host nfs mounted filesystem

Issue

The setting involve 3 machines:

• metro a 'undefined' machine

• qualif, a Red Hat Enterprise Linux 5 box.

• filer, a nfs filer.

• qualif is mounting a share exported by filer:

filer:/vol/QAKRM01 on /data/ora/PKRM01 type nfs (rw,nosuid,nodev,nfsvers=3,tcp,bg,hard,nointr,nolock,rsize=32768,wsize=32768,timeo=600)

• A file has been created randomly with on metro with :

dd if=/dev/urandom of=test.dump bs=1024 count=10000000

• If user foo, logged on metro, scp test.dump on qualif in his  home directory, the file will be there with the same md5sum as the one computed on metro.

• If user foo logged on metro, scp test.dump on qualif in /data/ora/PKRM01 (the share physically hosted on filer), then the md5sum of the resulting file will not match the original file.