Fence a race condition by checking the presence of partitions (#123)

Wait for partitions to appear in /dev
Make sure they are block devices before running mkfs

fs-ansible/roles/lustre/tasks/format.yaml

@@ -40,6 +40,13 @@
         state: present
       loop: "{{ mdts.keys() }}"
 
+    - name: Wait for MDT partition to appear in /dev
+      wait_for:
+        path: "/dev/{{ item }}p1"
+        timeout: 30
+        sleep: 5
+      loop: "{{ mdts.keys() }}"
+
     - name: Reformat MDTs
       command: "/usr/sbin/mkfs.lustre --mdt --reformat --fsname={{ fs_name }} --index={{ item.value }} --mgsnode={{ mgsnode }}{{ lnet_suffix }} /dev/{{ item.key }}p1"
       loop: "{{ mdts|dict2items }}"
@@ -56,6 +63,13 @@
          state: present
       loop: "{{ osts.keys() }}"
 
+    - name: Wait for OST partition to appear in /dev
+      wait_for:
+        path: "/dev/{{ item }}p2"
+        timeout: 30
+        sleep: 5
+      loop: "{{ osts.keys() }}"
+
     - name: Reformat OSTs
       command: "/usr/sbin/mkfs.lustre --ost --reformat --fsname={{ fs_name }} --index={{ item.value }} --mgsnode={{ mgsnode }}{{ lnet_suffix }} /dev/{{ item.key }}p2"
       loop: "{{ osts|dict2items }}"

fs-ansible/roles/lustre/tasks/wipe.yaml

@@ -17,4 +17,20 @@
     device: "/dev/{{ item }}"
     number: 2
     state: absent
-  loop: "{{ (mdts.keys() + osts.keys()) | unique }}"
+  loop: "{{ (mdts.keys() + osts.keys()) | unique }}"
+
+- name: Wait for MDT partition to disappear from /dev
+  wait_for:
+    path: "/dev/{{ item }}p1"
+    state: absent
+    timeout: 120
+    sleep: 5
+  loop: "{{ (mdts.keys() + osts.keys()) | unique }}"
+
+- name: Wait for OST partition to disappear from /dev
+  wait_for:
+    path: "/dev/{{ item }}p2"
+    state: absent
+    timeout: 120
+    sleep: 5
+  loop: "{{ (mdts.keys() + osts.keys()) | unique }}"