Published: 26 Jan 2012
The evolution of virtualization has affected efficient data centers of all sizes. Within a blink of an eye virtualization had been transformed from a tactical technology that businesses adopted to save space, cooling, power—essentially to do more with less—into a corporate strategy that responded to business demands.
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Virtualization has been around for many decades. In the beginning there were many naysayers and sceptics. But in the last 10 years, customer demand and the maturing x86 hardware platform has created a “perfect storm.” Within the space of just few years virtualization became the way to do things in an efficient data center. And as consequence, companies began adopting “virtualization first” policies.
The evolution of virtualization: Starting from modest beginnings
Starting from relatively modest beginnings, virtualization was introduced in late 1990s in the form of virtual machines (VMs) on PCs. One of the first of these was VMware Workstation, which was seen at the time as technology for geeks and developers who wanted to run multiple operating systems on computers without the need for complicated dual booting.
But the real impetus for server virtualization was customer demand. For years IT shops had been straightjacketed by the belief that each application or service should have just one OS.
This led to the proliferation of servers in data centers to the degree that few organizations even knew how many they had or where they were located. In fact, early capacity planning exercises for physical to virtual processes showed that there were servers on the network that some folks didn’t even know even existed.
Nowadays, it is fashionable to talk about VM sprawl. It’s amazing that we have forgotten about the situation that was often 10 times worse—physical machine sprawl.
Grappling with growth
In the previous decade, physical limits pushed data centers rapidly toward a brick wall as businesses grapple to cope with unchecked growth. Such was the case with data center capacity.
Organizations were literally running out of physical space, physical power and physical cooling. Building a new data center was a budget expenditure that many people could no longer accommodate. At the same time, a new generation of commodity-based hardware developed that was both relatively cost-effective and efficient in terms of incrementally growing in memory density and CPU horsepower.
Virtual desktops Still lagging behind
Through the evolution of virtualization, virtual desktops are the elephant in the room. Virtual desktops remain an important tool in the armoury of delivering applications to users. Although pundits proclaim that every year is the “year of the virtual desktop,” the technology has not seen widespread high-density adoption in the same way that server virtualization did.
Customers with efficient data centers are still facing barriers around management of virtual desktop images, despite the introduction of linked clones, streaming or storage vendor enabled rapid clones. Coupled with this is the endemic problems with the disk IOPS that large-scale deployments produce.
And although storage vendors have grabbed a market opportunity to sell additional cache and SSD drives, not every data center chooses to host VMs on the most expensive storage available just so their users can log in and open Microsoft Word. Most organizations would much rather prefer to put disk-intensive server applications on that tier of storage where the cost-benefit ratio is much more compelling.
In a short period of time, we have seen the ratio of VMs to physical machines—the server-consolidation ratio—increase as more powerful servers appear on the market each year for roughly the same price. This happened because of—rather than despite of—the recent downturn in the global economy.
The evolution of virtualization has bucked the market with its expansion while most areas have either stagnated or declined markedly. The reason is that although virtualization has start-up costs, it saves money in the long run.
Although the terms return on investment (ROI) and total cost of ownership have evolved into empty marketing phrases applied to sundry technologies, virtualization remains one of the few technologies that actually delivers on its promises for an efficient data center.
But it’s not like the evolution of virtualization hasn’t had its pain points, especially as businesses began to progress to a more application-focused way of leveraging virtualizations benefits. So as we moved away from the initial benefits of virtualization—server consolidation, among them—businesses with efficient data centers found that virtualization doesn’t always mean that every technology backed by virtualization is an automatic winner in every case.
Virtualization ecosystem matures
It’s only in recent years that the ecosystem that surrounds virtualization with supporting technologies has really matured. VM backup has become advanced in the sense that it now outperforms conventional in-guest agent-based backups.
The early promises of virtualized disaster recovery didn’t arrive as quickly as many people had hoped. Indeed, virtualized DR was one of the typical early usage cases for virtualization. But many organizations found this to be an expensive proposition, considering that the licensing costs made virtual DR quite a pricy insurance policy that they hoped they would never have to use.
At the same time, many businesses were sceptical that virtual DR software was mature enough to accommodate the complexity of their needs. This space has now started to mature. The imminent re-release of VMware’s SRM should bring built-in replication and automated failback features.
Similarly, this will become a more competitive market with companies like VirtualSharp and Zerto going head-to-head with VMware. Competition is always good for customers—it leads to competitive pricing and companies raising the game against their foes rather than resting on their laurels.
The cloud has opened up a new phase of virtualization that adds another layer of abstraction above the virtualization layer itself. Just as consumers don’t need to know how the telephone works, it doesn’t matter to them how virtualization works in the cloud. The cloud seeks to hide the hypervisor, management layers, virtual switches and clusters that make virtualization work.
At this stage, it’s difficult to see whether the cloud will deliver on its potential or whether it will add yet another layer of complexity to the environments we manage. Between the continuing evolution of virtualization and the emerging cloud offerings, it’s going to be an interesting decade ahead for IT professionals.