Mailing List Archive: VM phase diagram

Hi, I have some questions on the different VM states.

1. I tried to redraw the state diagram and adding an additional state,
representing a VM that has been killed by the console command vm
destroy.

Is this correct? (hint: inline img following for all the text/plain
readers ;-) )

2. What exactly is the Unknown state? Are there any state changes (and
api calls) to recover an VM in the Unknown state - eg. into the halted
state?

3. And what happens to a VM that gets hit by the VM.destroy? Is this VM
completely deleted from the known space of the xend? So afterwards there
is no way to re-create it without the config?

4. What commands does the console command vm destroy exactly do? Does he
destroy the machine or just put it into the halted mode?

Uli Staerk wrote:
>
> Hi, I have some questions on the different VM states.
>
>
>
> 1. I tried to redraw the state diagram and adding an additional state,
> representing a VM that has been killed by the console command vm destroy.
>
>
>
> Is this correct? (hint: inline img following for all the text/plain
> readers ;-) )
>

I don't think you need such a state. 'xm destroy' is just a
hard-shutdown of the vm, analogous to pulling the power cord on a
physical system. Notice you can go from running to halted state using
hardShutdown (xm destroy) transition.

> 2. What exactly is the Unknown state? Are there any state changes (and
> api calls) to recover an VM in the Unknown state â€“ eg. into the halted
> state?
>

I haven't actually seen a vm in this state so don't know. My guess is
you could still move the vm to other states. At minimum it could be
deleted and created (or new'ed) again.

> 3. And what happens to a VM that gets hit by the VM.destroy? Is this
> VM completely deleted from the known space of the xend? So afterwards
> there is no way to re-create it without the config?
>

The vm transitions to powered off state. It can be started again with
'xm start domname'. It is still under control of xend.

> 4. What commands does the console command vm destroy exactly do? Does
> he destroy the machine or just put it into the halted mode?
>

Pulls the plug on the vm, causing it to transition to powered down state.

Regards,
Jim

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