Ceph » Orchestrator

ceph-ansible supported os tuning in which a set of options could be specified in your group vars that would be included in a file written to /etc/sysctl.d/ on a given set of hosts. Cephadm should try to include this feature as well.

From ceph-ansible

#os_tuning_params:
#  - { name: fs.file-max, value: 26234859 }
#  - { name: vm.zone_reclaim_mode, value: 0 }
#  - { name: vm.swappiness, value: 10 }
#  - { name: vm.min_free_kbytes, value: "{{ vm_min_free_kbytes }}" }

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