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15.5. Installing AIO The Java NIO journal gives great performance, but If you are running HornetQ using Linux Kernel 2.6 or later, we highly recommend you use the AIO journal for the very best persistence performance. It's not possible to use the AIO journal under other operating systems or earlier versions of the Linux kernel. If you are running Linux kernel 2.6 or later and don't already have libaio installed, you can easily install it using the following steps: Using yum, (e.g. on Fedora or Red Hat Enterprise Linux): yum install libaio Using aptitude, (e.g. on Ubuntu or Debian system): apt-get install libaio