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But stark economics may end up driving the adoption. The value and cost savings from virtualization techniques escalate as they extend from servers to applications to the PC experience itself.
We're also seeing a lot of churn in the concept of the client device itself. The notion of a full-fledged tower PC for every desktop use scenario—and the associated costs of maintenance, support, security, and upgrades—is giving way to the right device for the use case. Why not the right software service mix for the right use case too?
For hosting organizations, telcos, cloud services providers and software as a service providers, the allure of providing a complete PC desktop and the required applications as a subscription is enticing. But this is a big subject, and many people are still just wrapping their heads around the implications.
Consequently, I recently participated in a webinar with virtual desktop infrastructure vendor Desktone that I think really gets to some core issues and insights on VDI and the models that support it. Joining me in the discussion are Jeff Fisher, senior director of strategic development at Desktone; Rachel Chalmers, research director of infrastructure management, at The 451 Group, and Robin Bloor, analyst at Hurwitz & Associates.
Here are some excerpts:
Fisher: Clearly, everyone is talking about cloud computing. You can’t look anywhere within IT and not hear about it. It’s amazing to see it surpassing even the frenzy around virtualization. In fact, most of the conversations people are having today are around virtualization and how it can take place in the cloud. Everyone wants to focus on all the benefits, including anytime/anywhere access and subscription economics.
However, like any other major trend that unfolds in IT, there are a number of challenges with the cloud. When people talk about cloud computing with respect to the enterprise, in most cases they’re talking about virtualizing server workloads and moving those workloads into a service provider cloud.
Clearly, that shift introduces a number of challenges. Most notable is the challenge of data security. Because server workloads are very tightly-coupled with their data tier, when you move the server or the server instance, you have to move the data. Most IT folks are not really comfortable with having their data reside in a service provider or external data center.
For that reason Desktone believes that it’s actually going to be virtual desktops, not servers, that are the better place to start and are going to be what jump starts this whole enterprise adoption of cloud computing.
The reason is pretty simple. Most fixed corporate desktop environments—those are desktops that have a permanent home within your enterprise—already probably have their application and user data abstracted away from the actual desktop. The data is not stored locally. It’s stored somewhere on the network, whether it’s security credentials within the Active Directory (AD), whether it’s home drives that store user data, or it’s the back end of client-server applications. All the back end systems run within your data center.
The other interesting thing is this notion of the service-provider cloud, which is that it actually can traverse both the enterprise and the service provider data centers.
So, depending on the use case, service providers can either keep the virtual infrastructure and the racks powering that virtual infrastructure in their data center or they can, in certain cases, put the physical infrastructure within the enterprise data center, what we call the customer premise equipment model. The most important thing is that it doesn’t break the model.
There is flexibility in the location of the actual hosting infrastructure. Yet, no matter where it resides, whether it’s in a service provider data center or an enterprise data center, the service provider still owns and operates it and the enterprise still pays for it as a subscription.
Chalmers: There are three sensible places to run a desktop virtual machine. One is on the physical client, which gives you a whole bunch of benefits around the ability to encrypt and lock down a laptop and manage it remotely. One is to run it on the server, which is the very similarly tried-and-tested VM with VDI or Citrix XenDesktop method. That’s appropriate for a lot of these cases, but when you run out of server capacity or storage in the server-hosted desktop virtualization model a lot of companies would like elastic access to off-site resources.
This is particularly appropriate, for example, for retailers who see a big balloon in staffing—short-term and temporary staffing around the holiday seasons, although possibly not this year—or for companies that are doing things off-shore and want to provide developer desktops in a very flexible way, or in education where companies get big summer classes, for example, and want to fire up a whole bunch of desktops for their students.
This kind of elastic provisioning is exactly what we see on the server virtualization side around cloud bursting. On the desktop side, you might want to do cloud bursting. You might even want to permanently host those desktops up in the cloud with a hosting provider and you want exactly the same things that you want from a server cloud deployment. You want a very, very clean interface between the cloud resources and the enterprise resources and you want a very, very granular charge back in billing.
And so, we see cloud-hosted desktop virtualization as a special case of server-hosted desktop virtualization.
Gardner: I think we’re entering a new era in how people conceive of compute resources. ... What’s happening now is that organizations are starting to re-evaluate the notion that a one-size-fits-all PC paradigm makes sense.
We have lots of different slices of different types of productivity workers. As Rachel mentioned, some come and go on a seasonal basis, some come and go on a project basis. We’re really looking at a slice-and-dice productivity in a new way, and that forces the organization to really re-evaluate the whole notion of application delivery.
When you start moving toward virtualization and you start re-thinking about infrastructure, you start re-thinking the relationship between hardware and software. You start re-thinking the relationship between tools and the deployment platform, as you elevate the virtualization and isolate applications away from the platform, and you start re-thinking about delivery.
If you take the step toward terminal services and delivering some applications across the wire from a server-based host, that continues to tip this a little bit toward, “Okay, if I could do it with a couple of apps, why not look at more? If I could do it with apps, why not with desktop? If I can do it with one desktop, why not with a mobile tier?”
If we look at the cost pressures that organizations are under, recognizing that it’s maintenance and support, and risk management and patch management that end up being the lion’s share of the cost of these systems, we’re really at a compelling point where the cost and the availability of different alternatives has really sparked sort of a re-thinking.
So we’re really going through this period of transformation, and I think that virtualization has been a catalyst to VDI and that VDI is therefore a catalyst into cloud. If you can do it through your servers, somebody else can do it through theirs.
When we start really seeing total costs tip as a result, the delta between doing it yourself and then doing it through some of these newer approaches is just super-compelling. Now that we’re entering into an economic period, where we’re challenged with top-line and bottom-line growth, people are not going to take baby steps. They’re going to be looking for transformative, real game-changing types of steps.
This is particularly relevant if they’re commodity level types of applications and services. It could be communications and messaging, it could be certain accounting or back office functions. It just makes a lot of sense to start re-evaluating. What we haven’t seen, unfortunately, is some clear methodologies about how to make these decisions and boundaries inside of organizations with any sort of common framework or approach.
It’s still a one-off company by company approach—which workers should we keep on a full-fledged PC? Who should we put on a mobile Internet device, for example? Who could go into a cloud-based applications hosting type of scenario that you’ve been describing?
It’s still up in the air and I’m hoping that professional services and systems integrators over the next months and years will actually come up with some standard methodologies for going in and examining the cost-benefit analysis, what types of users and what types of functions and what types of applications it makes sense to put into these different ... environments.
Bloor: One of the things that is really important about what’s happening here with the virtualization of the desktop is just the very simple fact that desktop costs have never been well under control.
The interesting thing is that with end users that we’ve been talking to earlier this year, when they look at their user populations, they normally come to the conclusion that something like 70 or 80 percent of PC users are actually using the PC in a really simple way. The virtualization of those particular units is an awful lot easier to contemplate than the sophisticated population of heavy workstation use and so on.
With the trend that’s actually in operation here, and especially with the cloud option where you no longer need to be concerned about whether your data center actually has the capacity to do that kind of thing, there’s an opportunity with a simple investment of time to make a real big difference in the way the desktop is managed.
... From the corporate point of view, if you’re somebody that’s running a thousand desktops or more it’s a problem. It is a problem in terms of an awful lot of things but mostly it’s a support issue and it’s a management issue. When you get an implementation that involves changing the desktop from a PC to a thin client and you don’t put anything into the data center, it improves.
You’ve now got a situation where you don’t need cages in the data center running PC blades or running virtualized blades to actually provide the service. You don’t need to implement the networking stuff, the brokering capability, boost the networking in case it’s clashing with anything else, or re-engineer networks.
All you do is you go straight into the cloud and you have control of the cloud from the cloud. It’s not going to be completely pain free obviously, but it’s a fairly pain-free implementation.
It absolutely stunned me that a cloud offering became available earlier this year because that meant that somebody would actually have had to have been thinking about this two years ago in order to put together the technology that would enable such an offering like that.
Gardner: This is a much more lucid and rational architecture. We’ve found ourselves, over the past 15 or 20 years, sort of the victim of a disjointed market roll out. We really didn’t anticipate the role of the Internet, when client-server came about. Client-server came about quickly just after local area networks (LANs) were established.
We really hadn’t even rationalized how a LAN should work properly, before we were off and running into bringing browsers in TCP/IP stacks. So, in a sense, we've been tripping over and bouncing around from one very rapid shift in technology to another. I think we’re finally starting to think back and say, “Okay, what’s the real rational, proper architectural approach to this?”
We recognize that it’s not just going to be a PC on every desktop. It’s going to be a broadband Internet connection in every coat pocket, regardless of where you are. That fundamentally changes things. We’re still catching up to that shift.
Bloor: From an architect’s point of view, if nobody had influenced you in any way and you were just asked to draw out a sense of a virtualization of services to end users, you would probably head in this direction. I have no doubt about it. I’ve been an architect in my time, and it’s just very appealing. It looks like what Desktone DaaS has here is resources under control, and we’ve never had that with a PC.
Read a full transcript of the webinar discussion. Listen and watch.
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Source：IT-Director.com
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