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Monthly Archives: April 2009

VMware Cost per Application Calculator Updated for vSphere

Just a quick note to everyone to let you know that along with the launch of vSphere last week, we were also able to update the VMware Cost Per Application Calculator to fully reflect vSphere pricing and packaging.  You will all now be able to model a vSphere environment and estimate the additional cost savings that vSphere can enable over Hyper-V – or to put it another way, how much more expensive Microsoft’s “free” Hyper-V offering really is.

And those vSphere cost savings apply to large enterprises and smaller environments alike.

Smaller IT Environment Using vSphere Standard

Just going through a quick calculation myself, I see that if I wanted to virtualize 50 applications using the vSphere Standard edition, I could expect a 21% savings over Microsoft Windows Server 2008 Hyper-V plus Systems Center.



And, I would actually break even with Microsoft offering – at the same consolidation ratio!



Large Enterprise Deploying vSphere Enterprise Plus

But even our top of the line vSphere Enterprise Plus solution is less expensive than Hyper-V. When creating 1,000 virtual machines on vSphere Enterprise Plus, an organization can expect to save 8% over Microsoft’s so-called cheaper offering – and the VMware offering is a production proven Cloud OS that can aggregate all aspects of your datacenter into a seamless pool of resources, whereas Hyper-V is just a hypervisor. vSphere: It’s the best solution, but you have to be willing to pay less for it!



And again the VMware customer would break even with Hyper-V at only an additional three VMs per ESX host – even with Enterprise Plus…



But Wait, There’s More!

The current version of the calculator assumes that vSphere will enable the same level of application consolidation as VI3. That is not really accurate. What we’re finding in our initial testing is that when 1) factoring only software improvements and 2) running on the same hardware on which we tested VI3, vSphere can enable 30% greater density than VI3. We’ll be validating this testing with a third party and will update the model soon. What this means of course is that vSphere can enable even greater savings over Hyper-V than what is represented here. (Especially when even Microsoft is seeing a whole 6:1 VM density on its Hyper-V servers)

And, when we account for the advances in hardware and utilize servers that incorporate the new Intel Nehalem microarchitecture, it just gets even better! Again, we’ll incorporate all that into the model soon.

Also Thanks for All Your Continued Feedback

We are working on some additions to the calculator – yes we’ll get a .pdf version of the report ready, so you can email the results to your boss. We might even add a Citrix comparison to the calculator as well – the results are very similar.

Is Microsoft Urging Their Partners to Stretch the Truth?

After catching Microsoft in the act of removing a layer of the Hyper-V architecture to back up their claims that VMware vSphere somehow “taxes” users with extra layers, it now appears that their partners are making unfounded derogatory statements about VMware while posing as VMware partners. If you haven’t seen it, ChannelWeb published an article this week titled, “Microsoft Continues To Rain On VMware's Parade”. In the article, after a repetition of “the additional layer theory” by David “substrate” Greschler, director of Microsoft virtualization and management, you will find a quote by Rand Morimoto, president of Convergent Computing, who is quoted as saying:

More and more of our customers are switching over from VMware to Hyper-V because Hyper-V uses a familiar interface, works out of the box and is included in the organization's existing licensing agreement."

The original version of the article identified Convergent Computing as a, “solution provider that partners with both Microsoft and VMware.” (CMP has since revised their article. It now says the company is a, “solution provider that has a staff of consultants with expertise in Hyper-V and VMware.”) Our partner team at VMware saw the article and immediately told us that Convergent Computing is NOT a VMware partner at all. That set off some alarms, so we followed Rand Morimoto on Twitter to see what else he had to say that might clear up the mystery. When we found him, we discovered he is essentially a Microsoft spokesperson who has even a Microsoft badge…check it out:

Rand Morimoto

If Rand is close enough to Microsoft to be issued a badge, we don’t think his comments about VMware users should be accepted as truth, especially when he provides no examples of customers who have supposedly made the switch to Hyper-V. The subterfuge didn’t fool us and it also didn’t fool the CMP readers, one of whom left this comment to the article:

“I have had the pleasure of knowing Rand Morimoto, president of Convergent Computing who is quoted in this article, for around 18 years (we both served on the Microsoft Partner Advisory Council and were Microsoft MVPs, and ran neighboring Novell Platinum shops before that).  While Rand is a brilliant and accomplished technologist as well as concert pianist, former gymnast, really nice guy and all around Renaissance man, one thing his organization is not is VMware certified.  This article makes it seem as if CCO is an unbiased partner of both Microsoft and VMware, but CCO credentials are 100% on the Microsoft side.“

Now that we’ve seen that the reference partners Microsoft trots out for the press can’t be trusted, let’s go back to talking about real technology instead.

Microsoft Does the Impossible – Eliminates Entire Layer from Hyper-V Without Doing a New Release!

Did you catch the latest video from Microsoft’s virtualization team?  In this one, the Microsoft guys are making the argument that VMware somehow imposes a “virtualization tax” by inserting an additional layer in your datacenter architecture that Microsoft doesn’t need.  I’m familiar with Microsoft’s Hyper-V architecture and knew that as far as the count of layers, it’s no different than VMware.  So what has changed?  Did Microsoft achieve the impossible and remove a complete layer from their virtualization architecture without so much as a service pack?

Here’s how the VMware architecture looks:


From bottom to top, I count four layers: 1) the x86/x64 hardware; 2) the hypervisor (VMware ESXi); 3) the guest OS in the VM; and 4) the application in the VM.  It’s nothing surprising and the same diagram we’ve used for years to explain how our products work.

Now, let’s take a look at the latest Microsoft architecture using a diagram from their video:



Wow, maybe they’re right!  I only count three layers.  How did they do it?  They got rid of an entire layer.  Is virtualization now part of the guest OS?  Maybe they figured out how to make their apps run directly on Hyper-V with no guest OS at all?  It’s especially amazing when all the Hyper-V product presentations I’ve ever seen and even Microsoft’s own virtualization white paper on their web site use a diagram like this:


This picture clearly shows the same four layers as the VMware architecture with Hyper-V operating as a type 1 or “bare-metal” hypervisor running directly on the hardware.  In fact, compared to the OS-free ESXi architecture, Hyper-V even adds in that extra copy of Windows Server 2008 you see on the left side.  Should we count that as a fifth layer?

So, has Microsoft achieved a software miracle by fully eliminating one or two layers from the Hyper-V architecture?  Are VMware users really stuck paying a “tax” due to an excess layer in our design?  Or could it be that Microsoft has simply redrawn their pictures and changed their story on how Hyper-V really works?  I’ll leave it to sharper minds than mine to uncover the answer to this mystery.

As to the Microsoft claims of costing one-third as much as VMware repeated yet again in their video, we ask that you not be fooled.  Microsoft may give away Hyper-V with Windows Server 2008, but they are charging big bucks for System Center management and all the servers, databases and agents you need to compare with our combination of VMware ESX and vCenter.  It’s not easy to figure out all the Hyper-V and System Center pieces required to run a given number of VMs, but we’ve done the hard work for you in our Cost-per-Application Calculator.  Give it a try and you’ll see that, even without the VM density advantage you get with our exclusive memory overcommit capability, VMware costs about the same as Microsoft.  You’ll also see that running just a few extra VMs per host with ESX operating at a very conservative level of memory overcommit quickly yields a 20-30% cost advantage for VMware.

Anyway, nice try with the sequel guys – do you have plans to make it a trilogy?

Why Choose VMware and Microsoft’s Supposed Mythbusting

VMware started the Why Choose VMware portion of our website in 2nd half 2008 as more and more vendors were coming on the scene, all claiming to offer products that do what VMware’s solutions do. We felt it was necessary to tell our story, and to back up our claims with complete, academic evaluations of competing products. As such, The Why Choose VMware site shares six key reasons why we see VMware as offering a better solution compared to what others market. There’s quite a lot of content there, but we tried to keep it as factually oriented as possible. For instance, the product comparison tables are lab-validated, based on our technical evaluations and comparisons of the products; they are not derived from just a cursory glance at vendor marketing literature.

Then this past week, we started getting inquiries about a Microsoft video that purports to bust the top ten “myths” on Why Choose VMware. Others in the blogosphere have already responded.

Ideally, we wouldn’t have to pay much attention to this Microsoft video, but because we stand behind what we post on Why Choose VMware, we felt it was important for our customers and other companies looking to deploy VMware to hear directly from us. Again, we don’t claim to be perfect and cannot say that we’ll never have any errors on the site, but we will attempt to base everything we claim on a technical evaluation of a currently available product. Microsoft’s answers to what it sees as “myths” don’t really even address factual errors – it’s just more marketing rhetoric. Feel free to take a look at the video for yourself (click on the screen shot) and form your own opinion. Then below, we’ll provide our response to each so-called “myth.”


When reviewing Microsoft’s video, please also make sure to also check out the user comments – they are pretty informative in regards to the ‘value’ the video provided to customers (and Microsoft partners). Two examples:

  • “My VAR business is fully baked in MSFT success.  So, I’m looking forward to a day when MSFT can compete with XEN and VMWare.  That said, this video is hogwash!  It’s embarrassing.  Quit producing this kind of stuff. you’re slowing my sales cycle!”
  • “Wow, if this is the Microsoft Virtualization Strategy team, the Microsoft Partners should be worried because Microsoft just doesn’t get it. As a long time Gold Partner, I find the embarassing. Come on guys, if you are going to release something like this, at least wait until you have a real released solution.”

And if you’ve never done so, read Why Choose VMware for yourself. If you do happen to find something that you feel is a factual error, leave us a comment here and we will recheck the facts and address it.

Responses for Each “Myth” in the Microsoft Video

Myth 1: Live Migration

Microsoft video (paraphrase): We’ll soon have live migration so VMware’s website is misleading.

The facts:

VMware’s website very clearly compares to Microsoft’s current shipping product – Windows Server 2008 – which does not have live migration. Microsoft likes to play the “futures” card and promote features that are not yet GA. Beta products (Windows Server 2008 R2 Beta and Hyper-V Server R2 Beta) don’t count because no one buys or deploys a beta product in production. Hyper-V Server R2 is rumored to ship (GA) in 2H’09 but most companies really won’t consider that product seriously – they’ll wait and evaluate Windows Server 2008 R2 instead, which Microsoft’s own website says is slated for 2010.

Even once Microsoft ships its implementation of live migration, it will be an unproven, version 1.0 Microsoft technology that lacks real-world reliability testing. In contrast, VMware VMotion is already in use by 70% of VMware VI3 customers in production environments. VMotion is well tested in production and customers trust it on their mission critical applications.

p.s. This is an example of typical Microsoft marketing. When it lacks a feature, it downplays it and says that no one needs it (see live migration example here). Once Microsoft is somewhat close to having that feature, then Microsoft starts talking about why that feature is a core requirement and claims that they’ve now caught up to VMware – even though Microsoft hasn’t yet shipped the feature. (We’ll see the same thing happen with Memory Overcommit – wait and see!)

Myth 2: Clustered File Systems

Microsoft video (paraphrase): Cluster Shared Volumes (CSV) is coming and it will address any deficiencies with Hyper-V’s lack of a clustered file system. VMware’s website is misleading in that it claims Microsoft lacks a true clustered file system.

The facts:

Again, the Microsoft video is promoting a future technology that has yet to GA – Cluster Shared Volumes (CSV). The Microsoft video also side-steps the issue that Cluster Shared Volumes is not a true clustered file system and therefore does not deliver all the benefits of a technology like VMware VMFS. CSV is just a layer built on top of NTFS that can only be used for Hyper-V.

Microsoft built CSV to do only one thing: to address a major limitation in Hyper-V 1.0, namely the requirement to have 1 VM per LUN in order to do VM-independent HA and quick migrations. But from Microsoft’s architectural descriptions of CSV, it appears that they’ve made trade-offs in performance by requiring multiple ‘coordination nodes’ that significant amounts of meta-data must route through.

Again, the VMware website clearly compares shipping VMware products to shipping Microsoft products. Microsoft needs to ship/GA CSV first before it earns the right to claim that they’ve got a capability.

Myth 3: Hyper-V is Version 1.0

Microsoft video (paraphrase): Hyper-V is a good version 1.0 Microsoft product

The facts:

No much to say here… Customers will decide for themselves how much of their business they will bet on a version 1.0 product from Microsoft.

Myth 4: Low Performance

Microsoft video (paraphrase): Hyper-V 1.0 performs well

The facts:

Microsoft likes to point to tests that usually run a low number of VMs per host. This type of test fails to address the fact that consolidation ratios are increasing in line with the increases in x86 hardware computing power (ex. Intel’s Nehalem generation of server processors have 8 cores per socket). Recent tests by the Taneja Group (commissioned by VMware) clearly show how Hyper-V can’t keep up with ESX as the number of concurrently running workloads increase – see report here. Hyper-V lack of scalability directly impacts a customer’s bottom line – see Myth 9 below.

Myth 5: Disk Footprint

Microsoft video (paraphrase): The code size of the hypervisor is not important

The facts:

The Microsoft video says that VMware should compare in-memory usage instead of disk footprint. The problem is that in-memory usage is very dependent on what’s running on the host at any given time, is not deterministic, and does not show the size of the trusted computing base.

Therefore, disk footprint is the better comparison. First, it’s an apples-to-apples comparison because it does not try to measure things while operations are running and memory usage is continually changing. Second, it more accurately shows the size of the trusted computing base. The premise is simple: the larger the trusted computing base, the more code there is to protect and maintain. VMware designed ESXi to reduce the amount of code that needs to be protected and maintained. Leading analysts have highlighted how Microsoft’s use of Windows in the parent partition is concerning because it represents a large potential attack point.

Myth 6: Broad Hardware Support

Microsoft video (paraphrase): Hyper-V supports a broad set of hardware.

The facts:

Yes, Microsoft’s Hyper-V architectural allows it to run the same devices as Windows Server 2008 because it uses the same generic, third-party device drivers. But that may not be a good thing. Microsoft has publicly stated (ex. at TechEd 2006) that third party devices drivers are the biggest culprit when it comes to Windows instability. So those are the same drivers that would be running a company’s virtualization deployment where reliability, stability, and uptime are paramount??

Myth 7: End-to-end System Center Management

Microsoft video (paraphrase): VMware’s website should compare to the entire Microsoft System Center suite

The facts:

The entire Microsoft System Center Suite (VMM, OM, CM) still does not come anywhere close to the virtualization management solutions found in VMware’s vCenter Suite. The full System Center does not have:

  • an automated workflow and failover solution for Disaster Recovery (like VMware SRM),
  • a self-service, multi-tier, lab automation solution (like VMware Lab Manager),
  • an integrated solution to patch off-line VMs (like VMware Update Manager),
  • a non-disruptive maintenance mode for host updates (built into vCenter Server),
  • a VM lifecycle management solution (like VMware Lifecycle Manager),
  • and the gap will grow larger once VMware releases its upcoming management offerings later on in 2009.

Myth 8: Memory Oversubscription

Microsoft video (paraphrase): Memory oversubscription is not as important as VMware makes it out to be. It can also have an impact on performance.

The facts:

The Microsoft video does not deny that memory oversubscription is useful. Instead, they question the 2:1 ratio that is seen in some of VMware’s prior material. 2:1 was used because VMware clearly saw customers who were able to achieve this ratio in their environment. VMware summarizes the findings from a customer survey on memory overcommit in a blog for those who are interested in how much memory oversubscription is used by VMware customers.

The video also claims that performance can be impacted when using memory oversubscription when applications need all the memory. First, that’s like saying “CPU oversubscription can impact performance if applications require all the CPU.” Remember, physical resource oversubscription is the whole point of server consolidation. Server applications have been found to NOT require all of their physical resources at the same time. So, why virtualize and then lock up resources (such as RAM memory) like was previously done on non-virtualized physical servers? That’s the type of behavior that led to physical server sprawl in the first place. Second, a recent Taneja report (commissioned by VMware) showed an example of how VMware ESX can achieve near-linear scaling even when oversubscribing memory up to a 2:1 ratio (see DBHammer/SQL graph on page 6 of the report).

However, let’s step back for a moment. What a customer cares about is not memory oversubscription in and of itself – they care about the final cost to run the X number of applications that keeps their business going. In a virtual environment, one must understand VM density in order to figure out that cost. Earlier VMware material focused only on memory oversubscription because it was a straight forward way to explain one technology that allowed VMware to achieve higher VM densities.

Since then, VMware has received customer feedback that many other VMware technologies contribute to the higher VM densities and asked why VMware does not talk about those. So here are the top 5 VMware technologies that contribute to higher VM densities (including memory oversubscription):

  • Memory Oversubscription – More efficient use of physical RAM by reclaiming unused physical memory and consolidating identical memory pages among VMs on a host.
  • Direct Driver Model – VMware ESX can achieve very high I/O throughput and can handle the I/O requirements for more VMs simultaneously requesting hardware resources.
  • Support for Large Memory Pages and Nested Page Tables – Optimize memory access and can provide substantial performance benefits for mission critical, memory-intensive applications, can reduce CPU resource consumption by up to 15%.
  • DRS with Resource Pools – Dynamically load balance VMs across a cluster so applications get required resources when they need them -a “safety net” that lets administrators run individual servers at higher utilization levels while meeting service level agreements.
  • High Performance “Gang” Scheduler – Can account for CPU and I/O needs of virtual machines by dynamically allocating more resources and larger processor timeslices to VMs.

Myth 9: Lower Cost Virtualization Solutions

Microsoft video (paraphrase): Cost-per-application is a theoretical argument.

The facts:

The Microsoft video claims that cost per application is too “theoretical.” That’s like saying “miles per gallon” on a car is not a relevant metric. As explained on Why Choose VMware, a virtual server represents a many-VMs-to-one-host relationship. So it is imperative to understand how many VMs can run per host as that directly impacts how much software, hardware, and infrastructure are required to virtualize the entire datacenter. It’s quite straightforward: the more VMs one can run on a host, the lower cost it is to the customer. This is one reason why VMware made available its Cost-per-Application Calculator for customers to run different scenarios. The output report includes all of the assumptions and formulas so people can see exactly how the results were calculated.

The Microsoft video also says that people should not compare to VI3 Foundation or other VMware SKUs because they do not match up to Microsoft’s “enterprise” offering. They say that people should only compare to VMware VI3 Enterprise Edition. That’s just not credible since Microsoft’s comparisons always leave out the fact that VI3 Enterprise Edition delivers capabilities that Microsoft Hyper-V lacks. A few examples: VMotion, DRS, Storage VMotion, logical resource pools, DPM, ultra-thin hypervisor offering, off-host backup proxy, …

Myth 10: Need VMware Virtualization?

Microsoft video (paraphrase): VMware wants you to believe that only VMware has the right solution. In reality, Microsoft offers everything you need, and it simplifies the solution stack to 3-layers instead of 4-layers (if you went with VMware).

The facts:

VMware does believe that it has the better solution – what successful company doesn’t? To support this belief, the assertions and comparisons on the VMware website are based on lab-validated evaluations of the different products. This approach lets the customer decide which offering is best for their requirements.

It is rather ironic that right after criticizing VMware for claiming to have a better solution, the Microsoft spokespeople come right back and say that the Microsoft offering is all that’s needed when it comes to virtualization. The spokespeople essentially say: why bother looking at VMware (or any other third-party software, for that matter) to help you run your business better? Windows is all you need – anything else just adds complexity and cost. In fact, Microsoft’s solution eliminates an extraneous layer from the stack…

VMware prefers to let the market decide on who delivers more value to the customer by having products available today that can meet their requirements.

p.s. In actuality VMware ESXi simplifies that stack. It removes the need for an instance of a general purpose operating systems (ex. Windows in the parent partition) to be running as part of the virtualization layer.