Showing posts from August 5, 2012

Network traffic analysis in a virtualized environment

David Davis
Over the years, network administrators have come up with tried-and-true methods for analyzing and troubleshooting the physical network, using SNMP and NetFlow for data collection or protocol analyzers to look at raw network frames and packets. But what happens now that we've moved into the era of virtual networks?  The good news is that existing network traffic analysis strategies can be used in virtual networks with just a few small differences.
Virtual networks are not so different Virtual networks work very much the same as physical networks. In many cases, only the names of network devices have changed. For example:
A network interface card (NIC) is now a "virtual NIC" (vNIC).A switch is now a "virtual switch" (vSwitch). vSwitches work very similarly to physical switches but don't have the config ability commonly found in traditional switches (such as showing the MAC addresses).Multiple vSwitches can be created on each host, and ports on a v…

IT Management: Moving from Plan-Build-Run to Demand-Supply-Execute

Posted onMay 22, 2012byCharlie Betz
I want to outline briefly some ideas I’ve had recently about our fundamental models for understanding IT management.
In 1968, Melvin Conway proposed an insightful law, basically stating that our systems are copies of our communication structure (how we interact as human beings). And while this law is often applied in discussions of computer program structure, his intent was broader, including any human created system.

In the broad system of IT management, we often hear of the basic three stages, “Plan-Build-Run.” We make plans for a new IT system, we construct it, and we run it. IT organizations structure themselves and communicate to a large degree along these lines. I’ve used them myself in any number of writings. However, increasingly I have come to believe that that as a basic structure for understanding IT management, “Plan-Build-Run” (which I’ll abbreviate PBR) has seen its day.
While it pervades IT management thinking, and can cl…