Red Hat Linux - Disk File System Read Ahead

If there are issues with disk I/O or CPU wait time, you might consider fine tunning read ahead disk parameters:

1. Check current values and volumes:
blockdev --report

2. Set up proper parameters:
sudo blockdev --setra 256 /dev/xvda


If you want to read more, good documentation is here:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/main-fs.html