Today's move by Citrix to put its CloudStack IaaS solution into the Apache Foundation says more about the state of the cloud market than it does about OpenStack. As our Fall 2011 Forrsights Hardware Survey shows, about 36% of enterprise IT leaders are prioritizing and planning to invest in IaaS this year. That means they need solutions today and thus service providers and cloud software vendors need answers they can take to market now. OpenStack, while progressing well, simply isn't at this point yet.
Second, Citrix needed to clarify the position of its current open source–based solution. Ever since Citrix joined OpenStack, its core technology has been in somewhat of a limbo state. The code in cloudstack.org overlaps with a lot of the OpenStack code base, and Citrix's official stance had been that when OpenStack was ready, it would incorporate it. This made it hard for a service provider or enterprise to bet on CloudStack today, under fear that they would have to migrate to OpenStack over time. That might still happen, as Citrix has kept the pledge to incorporate OpenStack software if and when the time is right but they are clearly betting their fortunes on cloudstack.org's success.
There are myriad other benefits that come from this move. Two of the biggest are:
Having attended the OpenStack Design Summit this week and at the same time fielding calls from Forrester clients affected by the Amazon Web Services (AWS) outage, an interesting contrast in approaches bore out. You could boil it down to closed versus open but there’s more to this contrast that should be part of your consideration when selecting your Infrastructure as a Service (IaaS) providers.
The obvious comparison is that AWS’ architecture and operational procedures are very much their own and few outside the company know how it works. Not even close partners like RightScale or those behind the open source derivative Eucalyptus know it well enough to do more than deduce what happened based on their experience and what they could observe. OpenStack, on the other hand, is fully open source so if you want to know how it works you can download the code. At the Design Summit here in Santa Clara, Calif. this week, developers and infrastructure & operations professionals had ample opportunity to dig into the design and suggest and submit changes right there. And there were plenty of conversations this week about how CloudFiles and other storage services worked and how to ensure an AWS Elastic Block Store (EBS) mirror storm could be avoided.
Forrester’s survey and inquiry research shows that, when it comes to cloud computing choices, our enterprise customers are more interested in infrastructure-as-a-service (IaaS) than platform-as-a-service (PaaS) despite the fact that PaaS is simpler to use. Well, this line is beginning to blur thanks to new offerings from Amazon Web Services LLC and upstart Standing Cloud.
The concern about PaaS lies around lock-in, as developers and infrastructure and operations professionals fear that by writing to the PaaS layer’s services their application will lose portability (this concern has long been a middleware concern — PaaS or otherwise). As a result, IaaS platforms that let you control the deployment model down to middleware, OS and VM resource choice are more open and portable. The tradeoff though, is that developer autonomy comes with a degree of complexity. As the below figure shows, there is a direct correlation between the degree of abstraction a cloud service provides and the skill set required by the customer. If your development skills are limited to scripting, web page design and form creation, most SaaS platforms provide the right abstraction for you to be productive. If you are a true coder with skills around Java, C# or other languages, PaaS offerings let you build more complex applications and integrations without you having to manage middleware, OS or infrastructure configuration. The PaaS services take care of this. IaaS, however, requires you to know this stuff. As a result, cloud services have an inverse pyramid of potential customers. Despite the fact that IaaS is more appealing to enterprise customers, it is the hardest to use.