I had a question on my old VMFS LUN Sizing article I did back in 2009… The question was how valid the used formula and values still were in today’s environment especially considering VMFS-5 is around the corner. It is a very valid question so I decided to take my previous article and rewrite it. Now one thing to keep [...]

When doing some research for the vSphere Clustering Technical Deepdive book I stumbled across something which was very surprising and difficult to grasp at first. I figured explaining it in a short article was the best approach. Many of  you have read the HA deepdive article or the book and know that das.failuredetectiontime is probably the most commonly used advanced [...]

Looking from the outside at the way HA in 5.0 behaves might not seem any different but it is. I will call out some changes with regards to how VM restarts are handled but would like to refer you to our book for my in-depth details. These are the things I want to point out: Restart priority changes Restart retry [...]

**disclaimer: Some of the content has been taken from the vSphere 5 Clustering Technical Deepdive book** The first time I was playing around with 5.0 and particularly HA I noticed a new section in the UI called Datastore Heartbeating. Those familiar with HA prior to vSphere 5.0 probably know that virtual machine restarts were always initiated, even if only the [...]

**disclaimer: Some of the content has been taken from the vSphere 5 Clustering Technical Deepdive book** As mentioned in an earlier post vSphere High Availability has been completely overhauled… This means some of the historical constraints have been lifted and that means you can / should / might need to change your design or implementation. What I want to discuss [...]

Someone just notified me through a comment on this blog that Amazon currently has the book on sale for $ 21.56. This is the black&white edition of vSphere 5 Clustering Technical Deepdive and can be found here. Just wanted to let you guys know so you could benefit from the $ 8.5 discount. There are 6 reviews and ratings currently, [...]

With vSphere 5.0 comes a new HA architecture. HA has been rewritten from the ground up to shed some of those constraints that were enforced by AAM. HA as part of 5.0, also referred to as FDM (fault domain manager), introduces less complexity and higher resiliency. From a UI perspective not a lot has changed, but there is a lot [...]