During my migration from vSphere 4.1 to vSphere 5.5, I ran into an issue I had never experienced before. When your VMware HA network is partitioned, vCenter will not let you perform VMotions. At first I was surprised but after some searching I learned the reasons behind it and it makes complete sense now.
Did you know about VMware HA admission control coupled to VM reservations? To be honest I thought I knew, but recently I was pointed to some details that showed me I was wrong. What I’m talking about is the cluster setting of “HA Admission Control” and how “Percentage of cluster resources reserved as failover spare capacity” […]
Many of you probably already heard about the book written by Duncan Epping and Frank Denneman on the ins and outs of HA and DRS. In December I received my copy and I finally finished it and must say I’m quite impressed by what these guys have written. The book has a nice clean layout […]
I bet many of you that are virtualizing Citrix XenApp, have read the Project VRC whitepapers and want to implement their best practices. Especially in small environments however, it can be a headache creating the design. My biggest headache was and is, is the way I can guarantee no CPU over commit for the pCPU’s […]
When I was writing an installation document on vSphere I thought and have some friends on twitter check the doc and comment on it. I received a lot of responses and decided to make a blog post out of it, so here it is.