Solution : https://service.sap.com/sap/support/notes/154912 (SAP Service marketplace login required)
Key words : 
/3 kernel directory /usr/sap/<sapsid>/sys/exe/run, db2/udb                        application server db2/390digital unix, 4lowest operating system releases changed, lowest operating system releases changed, operating system/database upgrade prior, higher operating system/database combinations, additional key words 31i_y2k, general/r3server/patches/rel31i/, general/r3server/patches/rel40b/, general/r3server/patches/rel31i_y2k/
Related Notes : 
       
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| 23875 | Released operating systems for R/3 3.0x/3.1x ORACLE | 
| 23872 | SAP Kernel 3.0x/3.1x INFORMIX: Released operating systems | 
| 23870 | Released operating systems for R/3 3.0x/3.1x SAP DB | 
| 19466 | Downloading SAP kernel patches |