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Recommendations For Using CIO/DIO For Filesystems Containing Oracle Files On AIX

edited Mar 2, 2017 12:46PM in Database Tuning (MOSC) 3 commentsAnswered ✓

Oracle document Doc ID 960055.1-  Recommendations For Using CIO/DIO For Filesystems Containing Oracle Files On AIX provides good information on the types and option for file systems on AIX.

Our environment is Oracle 12.1.0.2 on AIX 6.1.

The filesystems are JFS2 and neither CIO or DIO option is set.

However, the filesystemio_options parameter is set to SETALL.  According to the document, Oracle by default uses the CIO option to perform I/O on the Oracle files when filesystemio_options parameter=SETALL.

The document has the following statement, "Incorrect mount options for the file system used to store the Oracle binaries can cause memory exahustation. If using JFS or JFS2, make sure that the file system containing the Oracle software is mounted 'rw', and without the 'cio' option".

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