How to enable asynchronous I/O (AIO) support on Linux for DB2 9.1

setting DB2LINUXAIO variable to true

 
The DB2LINUXAIO enables asynchronous I/O (AIO) support on Linux operating systems. AIO allows DB2 processes to use system resources more effectively. For example, a DB2 process can perform other work while waiting for an I/O request to be completed. The libaio.so.1 shared library is required to use this feature.

Default: FALSE, Values: FALSE or TRUE

db2set DB2LINUXAIO=true

 Note: Setting DB2LINUXAIO to YES is recommended in Version 9.1. However, note that this registry variable is deprecated and will be removed in a future release as AIO will be enabled by default.

Source: Performance variables