[THIN] Re: VMWare ESX
- From: "Ron Oglesby" <roglesby@xxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Fri, 5 Dec 2003 08:35:13 -0600
Steve.
Gotta hit this one:
>What the published studies actually show is that you end up with less
users
>per Virtual Machine then on the same physical hardware, however, you
can >run
>more VM's than physical instances of the OS and as a result you
actually >end
>up with around 20% more total users on the same hardware!
I am not standing up for the published study thing BUT being with the
largest single location VMware partner I gotta talk about VM and Citrix
a little.
It has pros and cons and myself and another of our consultants here have
run some simulations and cost benifts and worry about the "perceived
savings" with Citrix and VM. We spec it for CSGs WI, ZDCs, under
utilized silos etc. BUT VMWARE shines when hardware is underutilized. If
your silo runs at 90% all the time (lets say processor) then taking two
duals and collapsing them onto a quad after the purchase of a VMware ESX
lic and their SMP lic module the cost is to high to justify unless the
primary goal is portability of the DSK files.
Now this is not to say that if you are hitting OS limits within a citrix
farm and not hardware limits (such as running out of paged pool kernel
mem, registry space etc) that using VMWare to partition the hardware
will get you more users/sessions per physical box. This is the truth.
BUT if your servers are truly physical resource constrained then we have
found it better to focus VMware in the lower utilized one off silos and
still have the ability to port primary silos to VMWare if needed (use a
PTV to get the images before hand and just store them)
Just my 2 cents.
Ron Oglesby
Senior Technical Architect
RapidApp
Office 312.372.7188
Mobile 815.325.7618
email roglesby@xxxxxxxxxxxx
-----Original Message-----
From: Steve Greenberg [mailto:steveg@xxxxxxxxxxxxxx]
Sent: Thursday, December 04, 2003 8:14 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: VMWare ESX
>>...The reason that I think we have not seen this is that people
perceive
that the overhead of VMware means that you end up with fewer concurrent
users on two VM's on a quad, then you would with two separate dual CPU
servers.
What the published studies actually show is that you end up with less
users
per Virtual Machine then on the same physical hardware, however, you can
run
more VM's than physical instances of the OS and as a result you actually
end
up with around 20% more total users on the same hardware!
Steve Greenberg
Thin Client Computing
34522 N. Scottsdale Rd. suite D8453
Scottsdale, AZ 85262
(602) 432-8649
(602) 296-0411 fax
steveg@xxxxxxxxxxxxxx
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