RHEL 7 grub modification

[cah]

In order to disable I/O schedule in RHEL, the following steps need to be followed:

1. Append "elevator=noop" to the end of "GRUB_CMDLINE_LINUX" line in /etc/default/grub.

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GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=rootvg/LogVol00 rd.lvm.lv=rootvg/
LogVol01 rhgb quiet audit=1 elevator=noop"

2. Regenerate the "grub.cfg" file

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# grub2-mkconfig -o /boot/grub2/grub.cfg

4. After rebooting the server, check if the change is working as expected.

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# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-957.10.1.el7.x86_64 root=/dev/mapper/rootvg-LogVol00 ro crashkernel=auto rd.lvm.lv=rootvg/LogVol00 rd.lvm.lv=rootvg/LogVol01 rhgb quiet audit=1 elevator=noop