Starting in InnoDB storage engine 1.1, the asynchronous I/O capability
that has been supported on Windows systems, is now available on
Linux systems. (Other Unix-like systems continue to use
synchronous I/O calls.) This feature improves the scalability of
heavily I/O-bound systems, which typically show many pending
reads/writes in the output of the command
If a problem with the asynchronous I/O subsystem in the OS
prevents InnoDB from starting, set the option
innodb_use_native_aio=0 in the configuration
file. This new configuration option applies to Linux systems only,
and cannot be changed once the server is running.
This is the User’s Guide for InnoDB storage engine 1.1 for MySQL 5.5, generated on 2010-04-13 (revision: 19994) .