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

[Tom Brown <tbrown@xxxxxxxxxxxxx>]

On Thu, 31 Aug 2006, Jason wrote:

> 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. 

CPU is unlikely to be your problem... which of course is what you opened 
with, but then suggest using hardware to offload the CPU ... huh?

My suggestion is to use more (possibly smaller) drives and spread the load 
across the spindles... if you put each domU on a separate drive I doubt 
you will see much affect on the other domUs if one goes I/O bound...

(of course if you're using iSCSI, AOE, NFS, or other network storage, then 
you may hit network or CPU bottlenecks....)

If you do, that's a scheduling issue which should be solved shortly with 
the new scheduler. 

I/O bottle necks IMHO are one of the most common system problems. 

-Tom

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