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xen-users
Re: [Xen-users] Xen clustering
Nico Kadel-Garcia wrote:
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.
Yes , i mean if we can freeze all of a context (context of processes of
OS on a VM) on the shared storage for Live-Migration because of VMM is
here then if some fault occurs migration to other host is practicable
is it?
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.
migrating to another non-utilized host (with some mechanisms) decreasing
redundancy not all redundancy is it?
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.
hmmm. yes.
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.
i think the above words is clear
thank you
Sadegh
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