Re: [Xen-users] Is it possible that save vm without destroy?

[tbrown@xxxxxxxxxxxxx]

On Wed, 28 Jun 2006, Thorolf Godawa wrote:

> Hi,
>
>  > And I want save vm1, but I don’t want vm1 destroy. But I command this.
>  > [root@localhost xen]# xm save vm1 vm1.save
>  > vm1 is destroyed…
>  > Is it possible that save vm without destroy?
> what do you want to do with the saved VM later?
>
> It is worthless because Xen only saves cpu- and memory-status but does
> NOT make a snapshot of the current filesystem-status.
>
> So if the VM is saved but running more time, the filesystem will change
> and get's out of sync with the saved cpu-/memory-status.
>
> This can cause a crash, data-corruption ...

you _could_ pause a domain, snapshot the filesystem _and_ save the
domain.... then unpause it and let it continue.  and/or you could clone
the save and the snapshot and let those run as well... I can not see a
_lot_ of applications for this, but I can imagine some... (e.g.
checkpoints are a good think in the world of fault tolerant computing.)



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