Solution : https://service.sap.com/sap/support/notes/686013 (SAP Service marketplace login required)
Key words : 
sdbupd log file/sapdb/data/wrk/saplivecacheupdate_install-<timestamp>, service entries  sql30           7200/tcp  sql6            7210/tcpare entered, report  /sapapo/om_lc_upgrade_41  switch livecache state back, offline  sap livecache instance update exited abnormally, sap livecache instance update exited abnormally, <dbm-userpwd> user_sap <standard livecache user>, <indep_data_path>/wrk/sapdbupdate_install-<date>-<time>, tablename  = '__$__lcflag'  err  -24988, livecache transaction data  stored, /    important general informationii/   error
Related Notes : 
       
| 898080 | SCM 4.0: SAP liveCache 7.5.00 replaces Version 7.4.03 | 
| 833216 | Parameter values as of liveCache Versions 7.5, 7.6 and 7.7 | 
| 785673 | MaxDB/liveCache upgrade to 7.4/7.5 w/ more than 64 DataVols | 
| 767873 | Support liveCache 7.5 on Tru64 | 
| 766458 | liveCache SDBUPD terminates when upgrading to 7.5.00 | 
| 737752 | Termination of the MAX DB/liveCache installation on AIX 5.1 | 
| 719652 | Setting initial parameters for liveCache 7.5, 7.6, 7.7 |