Solution : https://service.sap.com/sap/support/notes/326949 (SAP Service marketplace login required)
Key words : 
roll memory -> extended memory -> roll memory -> heap memorythe allocation unit, roll memory -> extended memory -> roll memory -> heap memorybgd, roll memory -> heap memory -> extended memoryaix implementation, planning guide sap web application server 620', /os component unix system services, setting parameters es/table = shm_segs, parameter es/table = unix_std, parameter es/table = shm_segs, os/390 planning guide, maximum roll area
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