Run fstrim daily on ZFS systems for zvols

playbooks/filesystem/common/etc/systemd/system/fstrim-daily.timer

@@ -0,0 +1,14 @@
+[Unit]
+Description=Discard unused blocks once a day
+Documentation=man:fstrim
+ConditionVirtualization=!container
+
+[Timer]
+OnCalendar=daily
+AccuracySec=1h
+Persistent=true
+RandomizedDelaySec=6000
+Unit=fstrim.service
+
+[Install]
+WantedBy=timers.target

playbooks/tasks/hosts/fstrim.yml

@@ -1,3 +1,20 @@
+# Run fstrim daily on ZFS. It's a no-op on ZFS filesystems, but it will run on zvols mounted via
+# fstab. This helps keep zvol space requirements down.
+- name: Configure daily fstrim timer
+  copy:
+    src: ./filesystem/common/etc/systemd/system/fstrim-daily.timer
+    dest: /etc/systemd/system/fstrim.timer
+    mode: 0644
+  register: systemd_fstrim_daily_timer_file
+  when:
+    is_zfs
+
+- name: SystemD daemon reload
+  systemd:
+    daemon_reload: true
+  when:
+    systemd_fstrim_daily_timer_file is changed
+
 - name: Enable fstrim
   systemd:
     name: fstrim.timer