Re: [Xen-devel] highly available xen

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

James Harper wrote:

> Has anyone done any work in developing some heartbeat scripts (or any
> other method) for making  xen domains highly available across multiple
> physical machines?
>
> By my reckoning the hurdles to overcome are:
> . make absolutely sure that the same domain doesn't start twice and hose
> it's filesystem (I've done this. It isn't pretty)
>  
This is a feature I'm going to eventually add to vm-tools.  It's a 
little non-trivial but I don't think it will be too difficult once the 
proper architecture is in place.
> . migrate a domain in the case of an orderly shutdown
>  
Not sure I understand this one.

> . restart a domain on another physical server in the case of a complete
> xen crash
>  
You mean have redundant copies of Xen and some sort of monitoring 
capability?  If one phys. server stops responding the other starts it's 
domains?
> . add some smarts to know how many domains a physical server can support
>  
This is a very interesting problem.  I don't think there's a right 
answer.  Any thoughts on appopriate heuristics?
> . prioritise critical domains over non-critical domains (eg a primary
> mail server might take priority over a secondary dns server)
>  
You can weight CPUs.  That's essentially what you're looking for right?

> Any thoughts?
>
> James
>
>
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>  
--
Anthony Liguori
anthony@xxxxxxxxxxxxx



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