Use libodm.so and you don't have to constantly wonder whether async I/O support is going to dop in and out of the picture between Linux OS releases. This is partly why Oracle came up with odm.h ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Magni Fabrizio Sent: Tuesday, March 21, 2006 2:25 AM To: Dave.Herring@xxxxxxxxxx; oracle-l Subject: RE: async i/o on 10g rhel 4 10gR2 for linux has the executable already linked for async I/O. It is not possibile to relink against different libaio anymore.