Add zfs scrubbing and filesystem trim

machine.yml

@@ -114,3 +114,89 @@
         daemon_reload: true
       when:
         systemd_status_mail_service_file is changed
+
+    # ----------------------------------------------------------------------------------------------
+    # ZFS scrubbing.
+    # ----------------------------------------------------------------------------------------------
+
+    - name: Zpool status mail script
+      template:
+        src: ./root/usr/local/bin/zpool-status-mail.j2
+        dest: /usr/local/bin/zpool-status-mail
+        mode: 0755
+
+    - name: Zfs scrub service file
+      copy:
+        src: ./root/etc/systemd/system/zfs-scrub@.service
+        dest: /etc/systemd/system/zfs-scrub@.service
+        mode: 0644
+      register: systemd_zfs_scrub_service_file
+
+    - name: Zfs scrub timer file
+      copy:
+        src: ./root/etc/systemd/system/zfs-scrub-monthly@.timer
+        dest: /etc/systemd/system/zfs-scrub-monthly@.timer
+        mode: 0644
+      register: systemd_zfs_scrub_monthly_timer_file
+
+    - name: SystemD daemon reload
+      systemd:
+        daemon_reload: true
+      when:
+        systemd_zfs_scrub_service_file is changed or
+        systemd_zfs_scrub_monthly_timer_file is changed
+
+    - name: Enable zfs scrub of bpool
+      service:
+        name: zfs-scrub-monthly@bpool.timer
+        enabled: yes
+        state: started
+
+    - name: Enable zfs scrub of rpool
+      service:
+        name: zfs-scrub-monthly@rpool.timer
+        enabled: yes
+        state: started
+
+    # ----------------------------------------------------------------------------------------------
+    # Filesystem TRIM.
+    # ----------------------------------------------------------------------------------------------
+
+    - name: Enable fstrim
+      service:
+        name: fstrim.timer
+        enabled: yes
+        state: started
+
+    - name: Zfs trim service file
+      copy:
+        src: ./root/etc/systemd/system/zfs-trim@.service
+        dest: /etc/systemd/system/zfs-trim@.service
+        mode: 0644
+      register: systemd_zfs_trim_service_file
+
+    - name: Zfs trim timer file
+      copy:
+        src: ./root/etc/systemd/system/zfs-trim-monthly@.timer
+        dest: /etc/systemd/system/zfs-trim-monthly@.timer
+        mode: 0644
+      register: systemd_zfs_trim_monthly_timer_file
+
+    - name: SystemD daemon reload
+      systemd:
+        daemon_reload: true
+      when:
+        systemd_zfs_trim_service_file is changed or
+        systemd_zfs_trim_monthly_timer_file is changed
+
+    - name: Enable zfs trim of bpool
+      service:
+        name: zfs-trim-monthly@bpool.timer
+        enabled: yes
+        state: started
+
+    - name: Enable zfs trim of rpool
+      service:
+        name: zfs-trim-monthly@rpool.timer
+        enabled: yes
+        state: started

root/etc/systemd/system/status-mail@.service

@@ -0,0 +1,8 @@
+[Unit]
+Description=Status email for %i
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/systemd-mail %i
+User=nobody
+Group=systemd-journal

root/etc/systemd/system/zfs-scrub-monthly@.timer

@@ -0,0 +1,12 @@
+[Unit]
+Description=Monthly zpool scrub timer for %i
+Documentation=man:zpool-scrub(8)
+
+[Timer]
+OnCalendar=monthly
+Persistent=true
+RandomizedDelaySec=1h
+Unit=zfs-scrub@%i.service
+
+[Install]
+WantedBy=timers.target

root/etc/systemd/system/zfs-scrub@.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Zpool scrub on %i
+Documentation=man:zpool-scrub(8)
+Requires=zfs.target
+After=zfs.target
+ConditionACPower=true
+ConditionPathIsDirectory=/sys/module/zfs
+OnFailure=status-mail@%n.service
+
+[Service]
+EnvironmentFile=-/etc/default/zfs
+ExecStart=/bin/sh -c '\
+if /usr/sbin/zpool status %i | grep -q "scrub in progress"; then\
+exec /usr/sbin/zpool wait -t scrub %i;\
+else exec /usr/sbin/zpool scrub -w %i; fi'
+ExecStop=-/bin/sh -c '/usr/sbin/zpool scrub -p %i 2>/dev/null || true'
+ExecStopPost=/bin/sh -c '/usr/local/bin/zpool-status-mail %i'

root/etc/systemd/system/zfs-trim-monthly@.timer

@@ -0,0 +1,12 @@
+[Unit]
+Description=Monthly zpool trim timer for %i
+Documentation=man:zpool-trim(8)
+
+[Timer]
+OnCalendar=monthly
+Persistent=true
+RandomizedDelaySec=1h
+Unit=zfs-trim@%i.service
+
+[Install]
+WantedBy=timers.target

root/etc/systemd/system/zfs-trim@.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=Zpool trim on %i
+Documentation=man:zpool-trim(8)
+Requires=zfs.target
+After=zfs.target
+ConditionACPower=true
+ConditionPathIsDirectory=/sys/module/zfs
+OnFailure=status-mail@%n.service
+
+[Service]
+EnvironmentFile=-/etc/default/zfs
+ExecStart=/bin/sh -c '\
+if /usr/sbin/zpool status %i | grep -q "(trimming)"; then\
+exec /usr/sbin/zpool wait -t trim %i;\
+else exec /usr/sbin/zpool trim -w %i; fi'
+ExecStop=-/bin/sh -c '/usr/sbin/zpool trim -s %i 2>/dev/null || true'

root/usr/local/bin/zpool-status-mail.j2

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+/usr/sbin/sendmail -t <<SYSTEMDMAIL
+To: root
+From: systemd <{{ hostname }}>
+Subject: zpool status $1
+Content-Transfer-Encoding: 8bit
+Content-Type: text/plain; charset=UTF-8
+
+$(zpool status "$1")
+SYSTEMDMAIL