Re: [Xen-users] Re-starting backend domain

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> I've taken the network card away from Dom0, and given it to a domain
> I'll call DomNet.  I'm able to bring up DomU domains that use DomNet for
> their network access.

Excellent.  Lots of people are using this partitioning functionality - it's 
good to see people taking advantage of it.

> However, if DomNet goes down once the DomUs are 
> running, I'm not able to bring DomNet back up and get the DomUs
> re-connected.  Basically, I think the issue I'm having is with
> re-connecting the driver back-end with the driver front-ends.

It *ought* to work but it's not been tried much: if domnet goes down, it still 
can't take the whole host down but it'd obviously be much better if recovery 
behaved correctly.

> Has anyone else done this?  Any hints on reconnecting?  Or is this
> something that just can't be done with the current code base?

This task should be performed by Xend but we've never really supported it in 
the 2.0 release.  There was an experimental version of Xend that we used for 
the restart experiments.

This really ought to be fixed but we could do with a volunteer to trace it 
down in the 2 series (this code will get rewritten for the 3 series, at which 
point it'll hopefully start working properly).  Basically one would need to 
add tracing to Xend and the drivers to see what part of the control message 
protocol is not being executed properly.

Cheers,
Mark

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