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.
VMware HA Admission Control and VM reservations
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” […]
Book review: VMware vSphere 4.1 HA and DRS technical deepdive
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 […]
How to supply resources for Citrix XenApp on VMware?
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 […]
VMware vSphere 4 default installation settings
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.