For folks who are still running the classic ESX hypervisor there is a new fling available to help smooth your migration to ESXi. The ESX System Analyzer scans existing ESX hosts looking for issues that could affect your transition to ESXi. It produces a nice report that you can use to assess your readiness and identify any potential risks that you should be aware of before moving to ESXi. Check it out, I think you'll like it.
The ESX System Analyzer is a tool designed to help administrators plan a migration from ESX to ESXi. It analyzes the ESX hosts in your environment and, for each host, collects information on factors that pertain to the migration process:
Hardware compatibility with ESXi
VMs registered on the ESX host, as well as VMs located on the host’s local disk
Modifications to the Service Console
RPMs which have been added or removed
Files which have been added
Users and cronjobs which have been added
This tool also provides summary information for the whole existing environment
Version of VMware Tools and Virtual Hardware for all VMs
Version of Filesystem for all datastores
By having this information, administrators can determine what tasks need to be done prior to the migration. Examples include:
Relocate VMs from local datastores to shared datastores
Make note of what agent software has been added to the host and obtain the equivalent agentless version
Replace cronjobs with equivalent remote scripts written with PowerCLI or vCLI
