ceph-ansible/roles/ceph-common/tasks/misc/system_tuning.yml

---
- name: disable osd directory parsing by updatedb
  command: updatedb -e /var/lib/ceph
  changed_when: false
  failed_when: false

- name: create tmpfiles.d directory
  file:
    path: "/etc/tmpfiles.d"
    state: "directory"
    owner: "root"
    group: "root"
    mode: "0755"
  register: "tmpfiles_d"
  when: disable_transparent_hugepage

- name: disable transparent hugepage
  template:
    src: "tmpfiles_hugepage.j2"
    dest: "/etc/tmpfiles.d/ceph_transparent_hugepage.conf"
    group: "root"
    owner: "root"
    mode: "0644"
    force: "yes"
    validate: "systemd-tmpfiles --create %s"
  when: disable_transparent_hugepage

- name: get default vm.min_free_kbytes
  command: sysctl -b vm.min_free_kbytes
  changed_when: false
  failed_when: false
  always_run: yes
  register: default_vm_min_free_kbytes

- name: define vm.min_free_kbytes
  set_fact:
    vm_min_free_kbytes: "{{ 4194303 if ansible_memtotal_mb >= 49152 else default_vm_min_free_kbytes.stdout }}"

- name: apply operating system tuning
  sysctl:
    name: "{{ item.name }}"
    value: "{{ item.value }}"
    state: present
    sysctl_file: /etc/sysctl.d/ceph-tuning.conf
    ignoreerrors: yes
  with_items: "{{ os_tuning_params }}"