After lots of testing I finally found that the described combination of software components is not working.
It seems that IBM C-Compiler xlc 9.0 is at its end of life. In the meantime I changed my environment: AIX from 5.300-12-03-1119 to AIX 6100-05-05-1112 PostgreSQL 9.1.2 to PostrgreSQL 9.1.3 IBM C-Compiler xlc 9.0 to IBM C-Compiler xlc 11.1 I can now confirm that the issue with initdb disappeared. Everything is working fine, again. However it is very sad that there is so few AIX support on this site :-( Best Regards Wilfried http://nsg.com/disclaimer
