add a script to check libvirt domains for TRIM readiness

libvirt-check-trim.py

@@ -0,0 +1,39 @@
+# Check if all libvirt domains are prepared for TRIM/fstrim
+
+from __future__ import division, print_function
+
+from lxml import objectify
+import libvirt
+import sys
+
+
+conn = libvirt.openReadOnly(None)
+if not conn:
+    print('Failed to open connection to the hypervisor!')
+    sys.exit(1)
+
+for domain in conn.listAllDomains():
+    print('== {}'.format(domain.name()))
+
+    xml = domain.XMLDesc()
+    tree = objectify.fromstring(xml)
+
+    # every disk should be scsi + discard=unmap
+    for disk in tree.devices.disk:
+        if disk.get('device') != 'disk':
+            continue
+
+        disk_desc = disk.target.get('dev')
+
+        if disk.target.get('bus') != 'scsi':
+            print('{} target should be scsi'.format(disk_desc))
+        if disk.driver.get('discard') != 'unmap':
+            print('{} driver should have discard=unmap'.format(disk_desc))
+
+    # every scsi controller should be model='virtio-scsi'
+    for controller in tree.devices.controller:
+        if controller.get('type') != 'scsi':
+            continue
+
+        if controller.get('model') != 'virtio-scsi':
+            print('scsi controller should be a virtio model')