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David Lenrow

David Lenrow was trained as a computer scientist and has spent more than 20 years driving innovation in digital technology with an emphasis on networks, storage and media. His career spans multiple roles from individual contributor to executive across all major functional areas in technology companies. He is passionate about innovation and seeking to make contributions to the cloud revolution currently sweeping the tech industry.

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SDN software defined networking Data Plane NFV

SDN: Software Defined Everything: Infrastructure Integration Will Never Be The Same

By: David Lenrow Posted: May. 06, 2013

Overshadowed by the widespread SDN-washing that is taking place with every product suddenly labeled as software-defined, there is at least one huge change sweeping the industry as a result of software defined everything that nobody’s talking about yet. It turns out that if you take two disparate systems that both have a (logically centralized) controller and well-designed, abstract APIs (i.e. hiding much…

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SDN Connectivity

Why Are They Hating On Layer-2?

By: David Lenrow Posted: Sep. 03, 2012

I don’t understand why nobody is willing to step over the line and deploy a massively scalable Layer-2-only data center network solution? As I have noted previously, your data center is not The Internet and it may not even be an internet. It has end stations that stick layer-3 IP headers on everything and see the world through IP address…

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Nicira plus VMware still not VMware of Networking

Still no VMware of Networking. Overlays change nothing beneath the surface.

By: David Lenrow Posted: Aug. 04, 2012

After all of the excitement caused (primarily by the price tag of) VMware’s  Nicira acquisition, we find that nobody including VMware/Nicira is the VMware of networking. VMware enabled server virtualization to take over the data center because it made it really easy to increase compute utilization by abstracting large numbers of servers/CPUs/Cores into  a shared pool of compute resources that…

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Oracle Buys Xsigo

Oracle acquires Xsigo – an Infiniband bet?

By: David Lenrow Posted: Aug. 03, 2012

Tom Nolle has done a great job of explaining that Oracle’s announced acquisition of  Xsigo is an Infiniband deal and that Xigo’s version of virtual networking has nothing to do with the kind of network virtualization that Nicira and clones are doing, nor does it have anything to do with SDN, OpenFlow or any other hot buzzwords in networking (http://blog.cimicorp.com/?p=861)….

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SDN OpenFlow Controller

Who Will Finish The SDN Controller?

By: David Lenrow Posted: Apr. 24, 2012

I spent some time recently looking at the state of the SDN/OF controllers available and realized that development has stalled well short of the original vision that was projected to change everything in networking. The controller discussions I read created a vision in my head of the controller as a powerful application development platform including a rich set of libraries…

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SDN Northbound API

A change is blowing in from the Northbound API

By: David Lenrow Posted: Apr. 17, 2012

OpenFlow, the southbound API between the controller and the switch, is getting most of the attention in the current SDN hype-fest, but the northbound API, between the controller and the data center automation system (orchestration) will yield the biggest impact for users. SDN has the potential to be extremely powerful because it provides a platform to develop new, higher level…

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SDNCentral

Why SDN Matters: Single Point of Management

By: David Lenrow Posted: Apr. 09, 2012

It’s possible that OpenFlow is the next big thing. It’s more likely that Software Defined Networking, with or without OpenFlow, is among the next big things. But it’s dead certain that Single Point of Management is a damn big thing and top of mind for cloud builders everywhere. And this is what makes SDN so exciting. Applications are moving to the…

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