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Re: [Xen-devel] [PATCH] Blktap: Userspace file-based image support.(RFC)

> This is the exact situation I had in mind.  I think it would be
> extremely cool to have a peer-to-peer block migration mechanism, which
> would allow the convenience of files for migration and the speed of
> block devices.  You could even have a method for migrating block
> images between machines, independent of a migration.  Imagine
> something like:
>   lvmcp /dev/vols/foo othermachine:/dev/vols

Yes, that could even be nice and generic to other use cases, which is always a 
good sign and a good way of getting extra developers.

> I think that would be neat.  It's rather straightforward too, I
> think.

Another thing I've always fancied is the ability to keep a virtual machine's 
memory and disk images on two machines in close-sync by continuously 
trickling diffs...  This would be used in cases (e.g. desktop migration to a 
mobile device, emergency server relocation) where you do have warning that a 
migration is required but you want really low latency (e.g. before your UPS 
runs out, so you can pick up your laptop and run to a meeting, etc, etc).


Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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