Solution : https://service.sap.com/sap/support/notes/861333 (SAP Service marketplace login required)
Key words :
preferipv4stack=true -jar '/usr/sap/<sid>/<instanceid>/sdm/program/bin/sdm, $sdm_com -jar '/usr/sap/<sid>/<instanceid>/sdm/program/bin/sdm, /usr/sap/<sid>/<instanceid>/sdm/program/config/sdm_jstartup, file /usr/sap/<sid>/<instanceid>/sdm/program/sdm_jdk, terms inet6addressimpl ipv6 ipv4 aix 64-bit ibm jdk reason, /usr/sap/<sid>/<instanceid>/sdm/program/sdm_prep_com, 64-bit ibm jdk, instance y35/jc00 [java, ibm 64-bit jdk, sdm jvm properties
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710146 | How to change J2EE Engine JVM Settings |