osd: add fs.aio-max-nr tuning

The number of osds per nodes is limited by aio-max-nr, default is low,
so we need to increase it.

Full story:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-August/020408.html

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1553407
Signed-off-by: Sébastien Han <seb@redhat.com>

roles/ceph-osd/tasks/main.yml

@@ -8,10 +8,8 @@
 - name: include check_mandatory_vars.yml
   include: check_mandatory_vars.yml
 
-- name: include misc/system_tuning.yml
+- name: include system_tuning.yml
   include: system_tuning.yml
-  when:
-    - osd_group_name in group_names
   # Hard code this so we will skip the entire file instead of individual tasks (Default isn't Consistent)
   static: False
 

roles/ceph-osd/tasks/system_tuning.yml

@@ -62,3 +62,12 @@
     sysctl_set: yes
     ignoreerrors: yes
   with_items: "{{ os_tuning_params }}"
+
+- name: increase aio-max-nr for bluestore
+  sysctl:
+    name: fs.aio-max-nr
+    value: 1048576
+    sysctl_file: /etc/sysctl.d/ceph-tuning.conf
+    sysctl_set: yes
+  when:
+    - osd_objectstore == 'bluestore'