Re: [Xen-users] Xen clustering

[sadegh <mshoosh@xxxxxxxxxxxxxxx>]

Tom Brown wrote:
> On Wed, 31 Oct 2007, Nico Kadel-Garcia wrote:
>
> > shacky wrote:
> > >  Hi.
> > >
> > >  I'm writing to the mailing list to know if Xen is what I'm looking 
> > > for.
> > >  I need a failover cluster with two completely and automatically
> > >  replicated and redundanced servers running Windows Server 2003
> > >  Standard.
> > >  Could Xen make this?
> > >  Where I can found some information about making this configuration 
> > > with
> > >  Xen?
> > >
> > >  Thank you very much for your help!
> > >
> > >  Bye.
> > Not..... exactly. You can keep multiple operating systems on a single 
> > server: you can migrate them from a common network storage to run on 
> > one server or another. But failover where one server's operating 
> > system fails or is disabled, and another takes over the function, is 
> > a much more interesting thing to do. To do complete OS failover, 
> > every physical component must be mirrored and matched and the 
> > connections duplicated
> what? Even if "every component must be matched", that would be a GREAT 
> reason to use XEN, as all the components are virtual, so of course 
> they match.
> .. And using XEN underneath a proprietory O/S allows you to do things 
> like replicate the filesystem via DRBD to another node... and/or make 
> backups via snapshots, etc...
> So, while the question is incomplete, and XEN isn't going to do the 
> job by itself, it is a very usefull tool in getting the job done... as 
> putting the proprietary OS inside a virtual machine gives you a degree 
> of control you might not be able to get on physical hardware. I've got 
> a couple of physical windows servers that I _wish_ were running inside 
> virtual machines.
> That said, while I do use DRBD in production, I have not configured 
> heartbeat to configure automated failover of services... nor do I make 
> much use of windows.
> -Tom
>
> > with failover redundancy, and that gets fascinating to support. It's 
> > also amazingly expensive, much more than the cost of a small set of 
> > duplicate servers.
> Nico, I like some of your answers... and some of them leave my mouth 
> hanging open. You don't leave yourself much wiggle room, it would be 
> really easy for some newbie to think they were "the definitive" answers.
> > If you have specific services running on those servers, you might be 
> > able to gracefully implement them in normal master/slave or 
> > master/master failover modes.
> > _______________________________________________
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> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
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Hi All,
   well , if  we  say  FailOver mechanism is stop one and restart 
another node it is true but if FailOver definition is  Migration from 
one node to another.
What is your idea about it?
increasing redundant hardwares is it?
and if we have proactive fault detection mechanism we can do it.
some related works exist.
My thesis is about this subject "Improving Survivability of  HA 
Clusters" (that Mission-Critical apps. runs on...)
if any body help me to Hacking Xen, heartbeat and implementing some 
other tools and compare results we can  publishing some Papers about 
this and have friendly work group!
I am ready to contribute and very appreciate.
Best Regards
Sadegh



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