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ESXi 5.5 is the Hypervisor from VMware
Understanding ESXi essentially drills down to understanding ESXi logs
This short video discusses the ESXi typical log location, summary of the log files, methods of viewing and collecting logs.
Logs discussed are
vmkernel.log
hostd.log
vmksummary.log
auth.log etc
You can get more information about VMware Logs in the KB below
http://kb.vmware.com/kb/2032076
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