Upgrading ESX Server involved upgrading the related applications in the VMware Infrastructure Suite at the same time. Single VMware ESX Server upgrades minus VMware Infrastructure Suite applications require users to upgrade the ESX Server OS to 3.5, followed by a VMware Infrastructure client to version 2.5 upgrade. However, most of us don't have such a simple configuration. Real VMware ESX Server production environments may consist of any number of ESX Servers, a VMware VirtualCenter Server, a VirtualCenter database, VMware License Server, VMware Consolidated Backup (VCB), VMware Tools in the Guest VMs, and the VI Clients. Though upgrading a single ESX Server from 3.x to 3.5 is relatively straightforward, having so many different pieces across the entire VMware Infrastructure Suite installation adds complexity to upgrades. For that reason, the pitfalls I list out below have to do with not only upgrading VMware ESX Server but also the entire VMware Infrastructure Suite. A particular...
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