diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst index 56c0a0c15360b77351ea7a98948c82f9e116ec57..6446a903caf49186695cfe6d51829ee32c0d6bd7 100644 --- a/docs/manpages/virsh.rst +++ b/docs/manpages/virsh.rst @@ -6970,7 +6970,7 @@ no vm state leaves the domain in an inactive state. Passing either the transient domains cannot be inactive, it is required to use one of these flags when reverting to a disk snapshot of a transient domain. -There are two cases where a snapshot revert involves extra risk, which +There are a number of cases where a snapshot revert involves extra risk, which requires the use of *--force* to proceed: * One is the case of a snapshot that lacks full domain information for @@ -6980,7 +6980,7 @@ requires the use of *--force* to proceed: libvirt that the snapshot is compatible with the current configuration (and if it is not, the domain will likely fail to run). - * The other is the case of reverting from a running domain to an active + * Another is the case of reverting from a running domain to an active state where a new hypervisor has to be created rather than reusing the existing hypervisor, because it implies drawbacks such as breaking any existing VNC or Spice connections; this condition happens with an active @@ -6988,6 +6988,13 @@ requires the use of *--force* to proceed: an inactive snapshot that is combined with the *--start* or *--pause* flag. + * Also, libvirt will refuse to restore snapshots of inactive QEMU domains + while there is managed saved state. This is because those snapshots do not + contain memory state and will therefore not replace the existing memory + state. This ends up switching a disk underneath a running system and will + likely cause extensive filesystem corruption or crashes due to swap content + mismatches when run. + snapshot-delete ---------------