[[qm_virtual_machines_settings]]
-Virtual Machines settings
+Virtual Machines Settings
-------------------------
Generally speaking {pve} tries to choose sane defaults for virtual machines
Locks
-----
-Online migrations and backups (`vzdump`) set a lock to prevent incompatible
-concurrent actions on the affected VMs. Sometimes you need to remove such a
-lock manually (e.g., after a power failure).
+Online migrations, snapshots and backups (`vzdump`) set a lock to
+prevent incompatible concurrent actions on the affected VMs. Sometimes
+you need to remove such a lock manually (e.g., after a power failure).
qm unlock <vmid>
+CAUTION: Only do that if you are sure the action which set the lock is
+no longer running.
+
ifdef::manvolnum[]