RE: [Xen-devel] XEN migration architecture question

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I have an important question about XEN's migation operation 
> related to the XEN block and network back/front drivers.  If 
> I migrate a domain from one machine to another in the middle 
> of heavy disk/network activity, what happnens to the 
> back/front end XEN drivers? (I see they have suspend/resume 
> operations but I don't believe they are being used)  I see 
> that the front end drivers are passing machine addresses to 
> the back-end drivers - are these pointers somehow still valid 
> when a domain is moved to another machine?  Shouldn't the 
> drivers wait until there is no I/O activity before being migrated?

The front end drivers store enough information to be able to re-issue
all unacknowleged IOs when resuming from a migration.

Ian


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