Public bug reported:
>From section 4.1 of Help/Contants from virt-manager:
Save saves the machine's memory image to disk, shutting the machine down
in the process. You can then Restore the machine from the Manager window
later. Note that if you really wish to preserve a VM in its saved state,
you will also need a snapshot of the VM's disk image at the time you
save it. If you start a VM that you have saved and then later attempt to
restore the same VM using the same disk image, you will probably lose
data or worse.
This is confusing and doesn't show Save's usefulness. A better wording
might be:
"Save pauses the VM (see Pause, above) and then saves the VM's memory
image to disk, shutting the VM down in the process. You can then Restore
and un-Pause the VM from the Manager window later. This might be useful
if you want to have your VM remember its state after rebooting your
host.
Note that Save is different than a snapshot, and you should only perform
Restore on a VM that has been Saved but not restarted. If you start a VM
that was saved, and then later attempt to restore this VM using the same
disk image, you will probably lose data or worse. If you wish to
preserve a VM in its saved state, you will also need a snapshot of the
VM's disk image at the time you save it. Snapshots are not supported by
virt-manager at this time."
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
From section 4.1 of Help/Contants from virt-manager:
- Save
- Save saves the machine's memory
- image to disk, shutting the machine down in the process. You can
then
- Restore the machine from the Manager window later. Note
- that if you really wish to preserve a VM in its saved state, you
will
- also need a snapshot of the VM's disk image at the time you save
- it. If you start a VM that you have saved and then later attempt to
- restore the same VM using the same disk image, you will probably
lose
- data or worse.
+ Save saves the machine's memory image to disk, shutting the machine down
+ in the process. You can then Restore the machine from the Manager window
+ later. Note that if you really wish to preserve a VM in its saved state,
+ you will also need a snapshot of the VM's disk image at the time you
+ save it. If you start a VM that you have saved and then later attempt to
+ restore the same VM using the same disk image, you will probably lose
+ data or worse.
This is confusing and doesn't show Save's usefulness. A better wording
might be:
"Save pauses the VM (see Pause, above) and then saves the VM's memory
image to disk, shutting the VM down in the process. You can then Restore
and un-Pause the VM from the Manager window later. This might be useful
if you want to have your VM remember its state after rebooting your
host.
Note that Save is different than a snapshot, and you should only perform
Restore on a VM that has been Saved but not restarted. If you start a VM
that was saved, and then later attempt to restore this VM using the same
disk image, you will probably lose data or worse. If you wish to
preserve a VM in its saved state, you will also need a snapshot of the
VM's disk image at the time you save it. Snapshots are not supported by
virt-manager at this time."
--
libvirt: documentation in virt-manager for Save is unclear
https://bugs.launchpad.net/bugs/194015
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