Solution : https://service.sap.com/sap/support/notes/635931 (SAP Service marketplace login required)
Key words : 
xx yy/mm/dd xxx - aix v4, xx xx-xx bit yymmdddownload, terms hdisk0 jfslog solution, read/write activity, undergoing high volume, $ saposcol -vsaposcol version, aix saposcol, iy46663 aix 5, high utilization, rootvg disk
Related Notes : 
       
| 626614 | AIX saposcol - wrong disk filtered | 
| 498112 | SAPOSCOL: Disk and file system filter |