Re: [Xen-users] Clustering

[Eduardo Bragatto <eduardo@xxxxxxxxxxxx>]

On Apr 6, 2011, at 12:34 PM, Jonathan Tripathy wrote:

> I'm still in deep thought about distributing raw CPU power across  
> multiple machines for Xen DomUs. Does Amazon really only run their  
> DomUs on single boxes? So their marketing that says "Elastic  
> Computing" is just a simple stop DomU, change config file, resize  
> lvm volume and restart DomU?
You don't really have to stop DomU to change all parameters -- a LVM  
resize would require it though.
Anyway, EC2 does not even have persistent storage, so there's no LVM  
there -- it's all about the CPU and RAM. And increasing CPU and RAM  
does not require the DomU to be restarted (see "xm mem-set" and "xm  
vcpu-set").
The term "elastic" comes from the idea that you can virtually  
increase / decrease CPU and RAM according to your needs. It does not  
mean you can "stretch" a VM to a size larger than a single physical  
server and span it across multiple boxes.
Their largest VM most likely takes an entire physical server.

Best regards,
Eduardo

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