Re: [Devel] Re: [RFC] Virtualization steps

[Kirill Korotaev]

Bill,

> > OpenVZ will have live zero downtime migration and suspend/resume some 
> > time next month.
> Please clarify. Currently a migration involves:
> - stopping or suspending the instance
> - backing up the instance and all of its data
> - creating an environment for the instance on a new machine
> - transporting the data to a new machine
> - installing the instance and all data
> - starting the instance

> If you could just briefly cover how you do each of these steps with zero
> downtime...

it does exactly what you wrote with some minor steps such as networking 
stop on source and start on destination etc.

So I would detailed it like this:
- freeze VPS
- freeze networking
- copy VPS data to destination
- dump VPS
- copy dump to the destination
- restore VPS
- unfreeze VPS
- kill original VPS on source

Moreover, in OpenVZ live migration allows to migrate 32bit VPSs between 
i686 and x86-64 Linux machines.

Thanks,
Kirill

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