How to disable NUMA in Red Hat Enterprise Linux system?

Solution Verified - Updated -

Environment

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

Issue

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

Resolution

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

Examples:

  • 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="rd.lvm.lv=rhel_vm-210/root rd.lvm.lv=rhel_vm-210/swap 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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1 Comments

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