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Re: [Xen-users] Clustering

To: Eduardo Bragatto <eduardo@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Clustering
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Wed, 06 Apr 2011 20:40:24 +0100
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On 06/04/2011 16:44, Eduardo Bragatto wrote:

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.

Well, it's good to know that they aren't doing any "magic" then :) (I'm guessing their persistent storage is the S3 side of things)

BTW, they are offering you a VM with 64 cores:


Look on the left in the box that says "HPC Trial". Is this just a physical machines with lots of real CPUs?


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