Re: [Xen-users] To Xen or not to Xen

[Jason <fearthepenguin@xxxxxxxxxxxxxxxxx>]

CPU wont be your bottleneck, drive IO will be.   Any time one of my 
DomU's goes IO crazy, the rest of my DomU's might as well be hammered.  
You can of course minimize that impact by using SCSI controllers or 
other IO devices that offload that work from your main CPU. 

Tim Post wrote:
> I think you'd find your best performance just by breaking up LAMP, if
> thats the intended use of the rig :) 
>
> Keeping mysql and Apache (or your web server of choice) on different
> dom-u's means all services have easier times finding contiguous blocks
> of cache to take to keep more child servers active during peak load
> times. 
>
> I'd actually create 3 guests, and just leave the scheduling at default
>
> 2 of them web servers, using a central SQL server, for a total of 3.
>
> You can also play around with scheduling later to tweak and learn. I try
> to keep everything that malloc()'s much more than it needs (like
> apache / mysql) on different dom-u's, whenever possible.
>
> Another config would be use 2 guests, one for sql, one for everything
> else. 'Elbow room' in cache is the idea, but having a failover for one
> (or both) would be ideal. 
>
> HTH
>
> -Tim
>
> On Wed, 2006-08-30 at 11:02 -0400, FranÃois Levasseur wrote:
>   
> > Hi
> >
> > I have a server, Dual Opteron 265 (dual core), witch allow me to have
> > 4 *virtual* CPUs. The server is dedicated to serving dynamic web page.
> >
> > I have 2 configurations in my mind:
> >
> > 1. I install one operating system; 
> > 2. I install Xen with 2 virtuals machines, each one with one cpu (dual
> > core).
> >
> > I'm not an expert so I'd like to know what is the best setup to get
> > the maximun of responsivness and speed from this server.
> >
> > Thank you
> >
> > Frank
> >
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> >     
>
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