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Re: [Xen-users] Clustering

To: Jeff Sturm <jeff.sturm@xxxxxxxxxx>, Xen List <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Clustering
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Wed, 06 Apr 2011 16:34:02 +0100
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On 06/04/2011 16:00, Jeff Sturm wrote:
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Miles Fidelman
Sent: Wednesday, April 06, 2011 10:15 AM

You might want to google "single system image" and take a look at
Distributed shared memory is a hard problem (consider how you'd
implement an efficient spinlock, for example).  Google for
"Cache-Coherent Distributed Shared Memory", e.g.

Even simple NUMA architectures are not well supported by modern
software.  Unfortunately it seems such machines are more theoretical
than practical at this time.

Ah well.

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?

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