Re: [Xen-users] Clustering

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

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:

http://aws.amazon.com/hpc-applications/

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


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users