For those who hadn’t seen it yet, the “vSphere 4.1 HA/DRS Deepdive” is available in the Kindle Lending Library! The Kindle Owners’ Lending Library is a collection of books that Amazon Prime members who own a kindle can borrow once a month, with no due dates. (Yes you will need a Kindle Prime subscription!) If you have a Kindle or are [...]

Last week at VMworld and on the VMTN community I had a couple of questions around resource management and HA Admission Control. It appears people were using HA Admission Control for managing resources within their environment. In other words, the amount of VMs that HA would allow you to restart would be leading for managing resources. But is that what [...]

A couple of weeks ago I was contacted about an issue with vSphere 5.0. When a VM Storage Profile was disabled / enabled it looked like HA and DRS got disabled as well. After diving in to the problem it appeared that both HA and DRS were still working. It seems that some how the vSphere Client thinks it is [...]

I was reading a whitepaper by VKernel and it mentioned the following “a failover host for these VMs requires sufficient idle resources“. In this whitepaper it is discussed how Monster VMs pose challenges for both HA and DRS. As I had a similar question last week at VMworld I figured I would post this. Also because it is fundamental to [...]

On twitter Mike Laverick asked a question around DRS Affinity Rules and if HA would respect these. In this particular instance the question was around VM-Host affinity rules and I noticed multiple tweeps responding and figured it would not hut to repeat this. There are two different types of VM-Host affinity rules: Must aka mandatory Should aka preferential The difference [...]

** Update: Available now: paperback full |paperback black & white ** I’ve seen a lot of crazy things, but when I clicked the amazon link for our book yesterday I literally jumped up and started cheering… Number 1 in “Computers & Internet”. These are the kind of things that make it all worth it! PS: We asked amazon/createspace to get [...]

** Update: Available now: paperback full |paperback black & white ** After months of hard work the moment is finally there, the release of our new book: vSphere 5.0 Clustering Technical Deepdive! When we started working, or better said, planning an update of the book we never realized the amount of work required. Be aware that this is not a [...]