I believe this is bug 6270440 looks to be fixed in 10.2.0.4. Fixed as part of base bug 5752399, patch available. https://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=406472.1 Attached is a little c program to monitor for direct io as well. On 11/21/07, DBA Deepak <oracle.tutorials@xxxxxxxxx> wrote: > Sorry for the late response. Even after mounting the filesystem with > "forcedirectio" option am unable to see a non-zero value as the third > parameter value to the ioctl() calls. I did the same experiment as > mentioned in your previous mail. > > Would you please tell is there any alternative to verify whether the > system is using directio or not? -- Regards, Greg Rahn http://structureddata.org