vSphere ESX Architecture:
vSphere ESX architecture is the virtualization Kernel, referred as VMkernel, it was improved with management partition know as Service console (Console operating system COS) with the infrastructure service agents like name service, time service, logging etc..,
In this architecture, many customers deployed other agents from 3rd parties to provide particular functionality, such as hardware monitoring and system management. Furthermore, individual admin users logged into the COS to run configuration and diagnostic commands and scripts.
vSphere ESXI Architecture:
In the new vSphere ESXI architecture, the Service console (COS) has been removed and all of the VMware agents run directly on the VMKernel. Infrastructure sercices provided through modules included with the VMkernel. Other authorized 3rd party modules , such as hardware drivers and hardware monitoring components, can run in VMkernel as well. Only modules that have been digitally signed by VMware are allowed on the system, creating a tightly locked-down architecture. Preventing arbitrary code from running on the vSphere host greatly improves the security of the system.
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