I had a question today from someone who asked if there was any point in enabling SIOC (Storage IO Control) when you have NIOC (Network IO Control) enabled and configured. Lets start with the answer: Yes there is! NIOC controls traffic on a single NIC port level. In other words, when you have 10GbE NIC ports and vMotion, VMs and [...]

A couple of days ago one of my colleagues released an article about Ephemeral Ports. The article explains about how Ephemeral ports could be used as a “backup” when vCenter is down. The summary of the article is in my opinion the paragraph I quoted below. If the inability to quickly provision a new VM or to reconnect a vNIC [...]

I just noticed that a new whitepaper was released and as the scoopmeister Eric Sloof hasn’t blogged about it yet I figured, he’s probably sleeping, I would blog about it. I just read the paper and it is a very good read and interesting to know that a single VM can actually saturate the bandwidth of a 10Gbps NIC. Also [...]

Yesterday I was answering some question in the VMTN Forums when I noticed that someone referred to my article about Hybrid vs full Distributed vSwitch Architectures. This article is almost two years old and definitely in desperate need of a revision. Back in 2009 when Distributed vSwitches where just introduced my conclusion in this discussion was: If vCenter fails there’s [...]

When we wrote the HA/DRS book both Frank and I were still very much in an “ESX Classic” mindset. Over the last weeks I had questions around resilient network configurations for ESXi. I referred people back to the book but the comments that I got were that the examples were very much ESX Classic instead of ESXi. Now in my [...]

Part 1 explained the basic concepts of networking within vCD(VMware vCloud Director), Part 2 focussed on Network Pools and Part 3 focussed on a use case which was a vApp directly connected to an External routed Org Network. It took me a while to develop part 3 and I wasn’t sure if I could find the time to do another use [...]

Part 1 explained the basic concepts of networking within vCD(VMware vCloud Director) and Part 2 focussed on Network Pools. In the final and 3rd part we will focus on a use case and what happens on the vSphere layer with these different types of vCD networks. I will cover just a single use case for now, but this one basically covers [...]