Solution : https://service.sap.com/sap/support/notes/986907 (SAP Service marketplace login required)
Key words : 
/unicode@sap -> unicode conversion guides -> unicode conversion tips & trickshttp, network connection configure jumbo frames, unicode conversion/system copy process, sap web application server release 6, unicode conversion/system copy, unicode migration/system copy, hardware vendor specific techniques, specific table size linit, additional log data file, dedicated private network segments
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