ceph-ansible/roles/ceph-osd/tasks/system_tuning.yml

---
- name: Create tmpfiles.d directory
  ansible.builtin.file:
    path: "/etc/tmpfiles.d"
    state: "directory"
    owner: "root"
    group: "root"
    mode: "0755"
  register: "tmpfiles_d"
  when: disable_transparent_hugepage | bool

- name: Disable transparent hugepage
  ansible.builtin.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 | bool

- name: Get default vm.min_free_kbytes
  ansible.builtin.slurp:
    src: /proc/sys/vm/min_free_kbytes
  register: default_vm_min_free_kbytes

- name: Set_fact vm_min_free_kbytes
  ansible.builtin.set_fact:
    vm_min_free_kbytes: "{{ 4194303 if ansible_facts['memtotal_mb'] >= 49152 else default_vm_min_free_kbytes.content | b64decode | trim }}"

- name: Apply operating system tuning
  ansible.posix.sysctl:
    name: "{{ item.name }}"
    value: "{{ item.value }}"
    state: present
    sysctl_file: /etc/sysctl.d/ceph-tuning.conf
    sysctl_set: true
    ignoreerrors: true
  with_items:
    - { name: "fs.aio-max-nr", value: "1048576", enable: "{{ osd_objectstore == 'bluestore' }}" }
    - "{{ os_tuning_params }}"
  when: item.enable | default(true) | bool