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Change I/O Scheduler on CentOS

trialbybyte:

To change the default scheduler from cfq to deadline simply edit /etc/grub.conf and add elevator=deadline to the kernel that is being used:

$ nano -w /etc/grub.conf

title CentOS (2.6.18-274.3.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-274.3.1.el5 ro root=LABEL=/ elevator=deadline
        initrd /initrd-2.6.18-274.3.1.el5.img

This entry tells the 2.6.18-274.3.1.el5 kernel to use the Deadline scheduler. Make sure to reboot the system to activate the new scheduler.