vSphere 5 Upgrade: PSOD for vSphere 4.1.0 Hosts

I had a customer get ambushed by this last week and wanted to put this out there so hopefully no one else will run into this huge problem.  There is a VMware KB article out regarding the issue, however none of the release notes or upgrade documentation has been updated to reflect the information in the KB article.  Bottom line: DON'T UPGRADE VCENTER TO V5 IF YOU ARE RUNNING VSPHERE 4.1.0 (NO UPDATES) ON YOUR HOSTS! The KB article can be found at the link here: clicky Most of us have read through the upgrade guide for vSphere…

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vCenter 5 Database Move: Update the tomcat DB pointer

Ran into a weird issue the other day and was totally perplexed.  I moved a vCenter database from one SQL server to another, as I have done numerous times before without issue, but this time something else cropped up.  The old SQL server kept receiveing login attempts from the vCenter server.  What?!?   My DSNs for vCenter and Update Manager had been changed to point at the new DB server.  All apps and plugins that query vCenter use these DSNs, WTF is going on? The "VMware VirtualCenter Management Webservices" service utilizes tomcat to connect…

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vSphere Customization Specification Manager Bug

I've been working at a client the past few weeks and one of my tasks was to begin the process of upgrading their infrastructure to vSphere 5.  As we all know, the first step is to upgrade vCenter.  So I walked through the upgrade across all three vCenter servers and everything seemed to be ok until we went to deploy a new VM using a customization specification that had been created previously under vCenter 4.1. During the customization process for the VM we received the infamous "Windows Setup encountered an internal error while loading…

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