Veritas InfoScale™ 7.4.3 Release Notes - Linux

Linux I/O Scheduler for Database Workloads

Veritas recommends using the Linux deadline I/O scheduler for database workloads on both Red Hat and SUSE distributions.

To configure a system to use this scheduler, include the elevator=deadline parameter in the boot arguments of the GRUB or LILO configuration file.

The location of the appropriate configuration file depends on the system's architecture and Linux distribution:

For the GRUB configuration files, add the elevator=deadline parameter to the kernel command.

For RHEL 7, add elevator=deadline to GRUB_CMDLINE_LINUX in /etc/default/grub.

For example:

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="vconsole.font=latarcyrheb-sun16 vconsole.keymap=us rd.lvm.lv=vgroot/root 
                    elevator=deadline crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

and then rebuild the /boot/grub2/grub.cfg file to reflect the changes:

A setting for the elevator parameter is always included by SUSE in its LILO and GRUB configuration files. In this case, change the parameter from elevator=cfq to elevator=deadline.

Reboot the system once the appropriate file has been modified.

See the Linux operating system documentation for more information on I/O schedulers.