In January, Citrix announced plans to make its XenServer products more compatible with partner Amazon Web Services' cloud, to help enterprises with XenServer-virtualised datacentres to easily hook into the public cloud.
That compatibility approach contrasts with that taken by Citrix's virtualisation rival VMware, which concentrates its cloud efforts on end-to-end solutions and makes its pitch for the enterprise by building services on top of its own hypervisor. For its part, Citrix focuses its enterprise efforts on its free Xen hypervisor and its involvement in the open-source and open-standards OpenStack cloud.
Simon Crosby, Citrix's chief technology officer for the datacentre and cloud, has a long history with the Xen hypervisor: he was tech chief at XenSource, which developed the Xen hypervisor, when the Cambridge-based company was acquired by Citrix in 2007.
Crosby explained to ZDNet UK why VMware's approach can encourage enterprise lock-in, why Amazon Web Services (AWS) has a potent lead in the cloud and why a major change is needed in the approach to cloud security.
Why does hypervisor dominance matter?
Because the VMware play is 100-percent based on its hypervisor only. To the extent the enterprise might care about being locked into a specific vendor, it does matter.
If I happen to have purchased VMware for my enterprise private server world, will I be able to use a cloud service from Rackspace or Fujitsu or Amazon? If it is providing very sticky services, am I locked into my VMware world?
People are terrified of what AWS can do.
In effect, [VMware has] trained the enterprise IT class to use the VMware management tools, and that skillset issue is important. If I'm in IT using VMware management tools, am I going to switch to something else running in the cloud? There's the human aspect as well: my humans are trained with VMware, so am I to train my humans to use Rackspace or Amazon?
My bet is that the innovation in a non-VMware world is greater than the innovation rate that VMware can sustain. There's a tonne of cool stuff coming that's not VMware. For example, I could consume ESXi, which is a free hypervisor [developed by VMware], and build the rest of the stack out of open-source software, making a mixed stack.
The choice of hypervisor is an interesting one. You'll find some KVM and some Xen, maybe some Hyper-V and even some VMware. But people are building these services through the consumption of open-source software, and OpenStack is the banner under which it is aligning.
OpenStack is about delivering the architecture for the massive cloud with rich networking services and security, and the ability to do things such as auto-scaling and a bunch of cool things you would typically expect to find in an Amazon infrastructure. The collaborators there are really interesting, so OpenStack is moving forward very, very fast.
What do you see happening for the cloud over the next decade? Could it be one composed of huge vendors and a few niche players?
I can see that happening. If you look at AWS, it is extremely powerful and here's why: the company produces its own infrastructure, builds its own servers and operate its own datacentres worldwide. It has enormous capacity.
In addition to that, AWS is an extremely smart and agile software-as-a-service (SaaS) company. It is adding services to that, and that is extremely sticky. Really, people are terrified of what AWS can do.
If you look at hosting [specialists] — and that would include Rackspace — they don't invent stuff, they just operate stuff at scale.
The rest of the bigger ones [cloud providers] are going to chase [AWS] and provide some sort of offering. It could look like a VMware offering. The challenge a service provider faces in that is that it is offering another company's product: VMware's.
Obviously there's Microsoft with Azure. But Azure is going to be highly Windows-focused — .NET and from a virtualisation perspective, Windows Server 2008 R2. Azure is still very much a work in progress, but I think Microsoft will do very well with its BPOS [Business Productivity Online Suite], and it will do well for specific enterprise apps.
Why is Amazon Web Services so dominant?
It operates at enormous scale; it builds its own stuff; it has all of the competitive advantages of, say, a Google, because it can put together a server for a couple of hundred bucks, and that gives them an enormous scale advantage.
As an e-commerce provider, it has grown an infrastructure that...