Confirming the use of the direct or concurrent I/O option (UNIX)

You can confirm and monitor the use of direct I/O or concurrent I/O (on AIX®) for cooked file chunks.

You can confirm the use of direct I/O or concurrent I/O by:

  • Displaying onstat -d information.

    The onstat -d command displays information that includes a flag that identifies whether direct I/O, concurrent I/O (on AIX), or neither is used for cooked file chunks.

  • Verifying that the DIRECT_IO configuration parameter is set to 1 (for direct I/O) or 2 (for concurrent I/O).

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