Re: [Xen-devel] Is continuous replication of state possible?

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> I've been playing around with Xen a couple of months now and I am very 
> much impressed. I am particularly found of the "live migration" feature. 
> I was wondering if it is possible to make a instance continuously 
> replicate the state of another instance and then make the other instance 
> run if the original instance fails.

Software-implemented hardware fault-tolerance is on the Xen
research roadmap.

It basically just requires deterministic execution and event
injection. Doing this for uniprocessor guests is fairly straight
forward. Doing it for SMP guests (with decent performance) is
going to be a huge challenge, as determinism is hard to achieve. We're
looking in to it...

Ian


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