Technology Short Take #24

Welcome to Technology Short Take #24, another instance of my irregularly-published collection of links, thoughts, and rants on various data center technologies like networking, operating systems, security, hardware, virtualization, and cloud computing. This is a slightly shorter version of my Technology Short Takes; I’m trying to pare down since some readers have indicated the previous Short Takes weren’t short enough. Anyway, I hope you find something useful.


  • This page is a decent reference to the open source software-defined networking (SDN) projects that are out there. While I’m sure it’s not comprehensive—open source projects can be difficult to track sometimes—it’s at least a good starting point.
  • Here’s an older article by Brad Hedlund on building a leaf-spine design with either 40G or 10G. Which is better? As usual, the IT answer is, “It depends.” It’s a good article overall, although it reminds me that I still have so much to learn in networking. It’s a good thing there are smart folks like Brad who are willing to share their knowledge.


  • Bromium finally “opened the kimono” to talk about what they’re doing. I had the chance to chat with Simon Crosby, and I must say that it’s pretty cool stuff. If you haven’t yet read it, check out Simon’s post at
  • While I was in Indianapolis last week for the Indianapolis VMUG, I sat in on a session by Lancope on the use of Netflow to secure your network. The presenter showed a list of open source Netflow tools. I haven’t gotten the specific list that the presenter used, but I did find this list—perhaps it will be useful.


  • In 2009 I wrote a piece explaining NPIV and NPV. In May Tony Bourke posted a write-up of NPIV and NPV as well, and did a good job of drawing some analogies about these technologies. There’s a great discussion going on in the comments as well, so I recommend reading the comments too.
  • This article is titled “Understanding IO,” but it really seems like more of a write-up on various IO analysis tools. Still quite useful, even though it seems to be a bit focused on Solaris.
  • I finally got around to reading Stephen Foskett’s I/O Blender series (part 1, part 2, and part 3), in which he describes the current state of storage and virtualization as a introduction to some of the ideas that VMware described in their “next-generation” storage presented last year at VMworld 2011; in particular, the demultiplexer.


  • Maish Saidel-Keesing has a three-part write-up on installing and configuring OpenIndiana in a VM (part 1, part 2, and part 3). This is not something I’ve had the opportunity to work with, although I have worked some with Solaris in the past. (In fact, this weekend I tried to find a Solaris 10 x86 ISO I used to have somewhere because I was going to build a Solaris 10 VM for some Puppet testing and couldn’t find it. Bummer.)
  • Via Vladan Seget, I saw that VMware vSphere 5.0 has achieved Common Criteria EAL4+ certification.
  • This VMware KB article has a great PDF attached that covers vSphere’s various memory management techniques.
  • Working your way toward taking the VCAP-DCD exam? This site, while a bit dated, has some good resources for VDCD410 (the vSphere 4 version of the exam). Of course, there’s also this little video training course that was recently released…
  • Here’s a Citrix Knowledge Center article that provides more information on SR-IOV (Single Root I/O Virtualization) support within XenServer (and, by extension, Xen Cloud Platform/XCP).
  • There’s an interesting note here about interactions between SIOC and SRM 5.

That’s it for this time around; feel free to add your own thoughts in the comments below. Courteous comments are always welcome!

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  1. Matt Palmer’s avatar

    Thanks for the link to the sdncentral sdn open source projects page. If you know of projects missing from the list please let us know and we’ll add them!


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