How to disable NUMA in Red Hat Enterprise Linux system?

Solution Verified - Updated -


  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7


  • How to disable NUMA in Red Hat Enterprise Linux system?


Adding the "numa=off" to kernel command line in boot loader configuration and rebooting the system will disable NUMA.


  • RHEL 4, RHEL 5, RHEL 6 (/boot/grub/grub.conf)
    title Red Hat Enterprise Linux AS (2.6.9-55.EL)
            root (hd0,0)
            kernel /vmlinuz-2.6.9-55.EL ro root=/dev/VolGroup00/LogVol00 rhgb quiet numa=off
            initrd /initrd-2.6.9-55.EL.img
  • RHEL 7 (/etc/default/grub)
    GRUB_CMDLINE_LINUX=" vconsole.font=latarcyrheb-sun16 crashkernel=auto  vconsole.keymap=us rhgb quiet numa=off"

Please note, on RHEL 7 grub config has to be rebuilt for changes to take effect:

~]# grub2-mkconfig -o /etc/grub2.cfg

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Good to know it can be disabled for newly installed kernels in /etc/default/grub.

~]# grub2-mkconfig -o /etc/grub2.cfg ---->>>>please note:the above command is available for BIOS-based machine。 If a UEFI-based machine, the command is:grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg Plaese modify 。 Please refer this article:

/etc/grub2.cfg is symlink pointing to proper EFI or BIOS grub.cfg; Therefore it is universal method of updating grub config.