[CentOS] New to VM

Les Mikesell lesmikesell at gmail.com
Wed Mar 3 14:53:32 UTC 2010


David Milholen wrote:
> What are some min requirements for Hardware and what performance 
> differences are there in just running another pid for an app?

That question is way too general to answer and also depends a bit on what VM 
approach (xen/kvm/vmware server, vmware esxi) you use.  As a rule of thumb, I'd 
expect to lose 10% in overall performance and much more than that from disk head 
contention unless you plan the layout very carefully and spread over independent 
drives.  You can make some (perhaps more than that) back by overcommitting the 
machines where the load is likely to be bursty and staggered and by having a lot 
of RAM for better disk buffering.

-- 
   Les Mikesell
    lesmikesell at gmail.com





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