AIO will help a lot for servers with a high I/O wait, like CDN servers. If a server's I/O wait is low, you do not need to use this. AIO is only available in 4.1.x releases.
If you have enough bandwidth, LiteSpeed can be used for CDN servers. For servers with high I/O wait, n worker process licenses + AIO is the best choice. The 'n' of n worker processes should match the number of hard drives of the server. Usually, each HD can handle two different I/O tasks at the same time without a serious drop in performance. It also depends on the type of these disks, for example: SCSI, SSD, or slow SATA disk, etc.
- Server, I/O, AIO
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