Asynchronous I/O is handled differently under AIX 6.1.
Prior to AIX 6.1, AIO is a device whose details are stored in the ODM and managed using the ‘chdev’ command.
From AIX 6.1 and above, AIO is no longer a device, and is managed using the ‘ioo’ command.
AIO is a prerequisite of Oracle, and must be ‘enabled’ prior to installing Oracle.
Prior to AIX 6.1, AIO is enabled as follows:

chdev –l aio0 –aautoconfig=available
mkdev aio0
chdev –l posix_aio0 –aautoconfig=available
mkdev posix_aio0

From AIX 6.1 and above, AIO is activated ‘dynamically’ as and when a program makes a call to AIO, so it is no longer necessary to manually enable AIO. The ‘ioo’ command is used change the properties of AIO only.

For more AIX 6.1 commands: Click here

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