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This seems to be a known issue - pl see these MOS Docs
9772888.8 - Bug 9772888 - "WARNING:Could not lower the asynch I/O ... It is set to -1" messages
Seems to be fixed on 184.108.40.206 (or 10.2.0.5 patch 1 for Windows - see MOS Doc 342443.1 (10.2.0.x Oracle Database and Networking Patches for Microsoft Platforms))
Pl open an SR with Support to verify if this is a cause for concern, as it is not clear from these docs whether this causes any corruption