Re: [Xen-users] Xen clustering

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

sadegh wrote:
> 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?
Slow down a moment. Failover means different things to different people. 
A full so-called "High Availability" solution, where each individual 
component can fail but the rest automatically switch the resources 
they're using, is useful sometimes but seriously expensive to implement, 
and the switchover mechanisms themselves create their own uncertainties.
> increasing redundant hardwares is it?
It's part of an integrated solution. The redundant hardware has to be 
cross-wired in usable failover setups for individual setups. Xen can be 
a very useful component for this, because the potentially more reliable 
centralized storage system can be made extremely robust and the servers 
swap domains as necessary to other working hardware.
> and if we have proactive fault detection mechanism we can do it.
Yes, but there are limits to this. Janitors blow fuses: cage monkeys 
accidentally crimp fiber, or disconnect idle connections. And hard 
drives fail without any warning whatsoever, even a few at a time. 
There's a white paper from Google on this I highly recommend, where 
roughly 30% of the drives fail without any SMART detection at all.
> 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
Ohhhh. Cool. It's not clear how much you need Xen for this, as much as 
integration of Xen with the available approaches.
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