Solution : https://service.sap.com/sap/support/notes/731937 (SAP Service marketplace login required)
Key words : 
setenv dbs_db2_use_drda 1  setenv dbs_db2_ssid <subsystem id>  setenv dbs_db2_user <db2 connect user>  setenv db2db6ekey <encoding key>  setenv db2codepage 819  setenv dbs_db2_use_accounting 1  source /home/<db2 instance>/sqllib/db2cshrc, dbs/db2/use_drda=1  dbs/db2/ssid=<subsystem id>   dbs/db2/user=<db2 connect user>   dbs/db2/use_accounting=1               remark, dbs_db2_use_drda=1  dbs_db2_ssid=<subsystem id>  dbs_db2_user=<db2 connect user>  db2db6ekey=<encoding key>  db2codepage=819  dbs_db2_use_accounting=1, dsnl081i status=startd  dsnl082i location          luname            genericlu  dsnl083i ddfd8a0            desapw00, [default_group]  con1=d8a0_on_ihsapde  [d8a0_on_ihsapde]  ssid=d8a0  host=ihsapde  port=7803  location=d8a0, chuser groups=<db2 instance group>  <sid>adm                        linux+solaris, export dbs_db2_user  db2db6ekey=<encoding key>, de  dsnl099i dsnltddf display ddf report complete, kernel directory /usr/sap/<sid>/sys/exe/run, choose 'control panel'->'system'->'advanced'->'environment variable'
Related Notes : 
       
| 848384 | DB2-z/OS: Inconsistent fields with DDIC type RAW/LRAW/VARC | 
| 836882 | DB2-z/OS: Manually Customizing DB2 Connect | 
| 784931 | Hom./Het.System Copy SAP Web AS 6.40 SR1 ABAP | 
| 769918 | DB2-z/OS: Upgrade to 6.20 with 6.40 kernel | 
| 750096 | DB2-z/OS: 6.40 downward compatible kernel | 
| 728743 | Series z: Release of DB2 V8 for SAP Components | 
| 717935 | DB2/zOS: FTP replacement by Stored Procedures | 
| 523552 | DB2/390: BW: DB-Connect |