Octave,
First, I'd like to thank you for the great articles you've written
regarding LDOMs. They are very clear and concise and offer a great
insight to the community. I'm going to respond inline to the
comments...
> Now on the flip side, in the future we'll have the ability to move a
> guest domain from one physical host to another without any
> clustering software. This will be known as "Live Migration". It has
> been mentioned a few times in our forum here. But basically, it'll
> give us a Vmotion type of functionality. That should probably be
> leveraged for moving a whole guest domain between servers.
This feature should be required and essential to the next release of
LDM. Xen does it, VMWare does it, and in a production environment I
believe it is required. We *need* a way to migrate guest domains
while they are running.
> It is important to understand the difference between HA clustering
> and the mobility of virtual machines.. they are different things:)
> Much in the way that VMWare Vmotion is not HA clustering.. it's a
> method of making a virtual machine mobile:) It has no ability to
> monitor your applications and services within your virtual machine.
> This is where HA clustering for applications and services should
> come into play.
I certainly believe there is a strong need for clustering
applications. I think a lot of people's needs would be met with the
following example:
HA Between 2 Physical Nodes
- If node A (Primary Domain A) goes down Node B (Primary Domain B)
comes online (boots) and starts applications (Guest Domains)
We do this internally today with "Failover Zones" and because most
production apps we use start at boot time.
I was recently reading about Citrix's XenServer (commercial Xen) and
they have their own built in "HA" solution. Essentially, they create
a "Resource Pool" (2 separate physical nodes) and have VMs running on
one of the nodes. If Node A goes down all the VMs migrate to Node B.
I haven't played with this technology yet but the idea (and if it
works as advertised) is very interesting. If future versions of LDM
could do this that would be a heck of a feature.
Regards,
Paul
--
______
/_____/\
/_____\\ \ Paul Roberts
/_____\ \\ / Sun Microsystems, Inc.
/_____/ \/ / / Sun Serviceability and Readiness Ops
/_____/ / \//\
\_____\//\ / / email: p.roberts at sun.com
\_____/ / /\ / direct: 877-477-7642
\_____/ \\ \
\_____\ \\
\_____\/ http://www.sun.com
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