Back to Basics – What is VMWARE ESXI?

VMware ESXi is the core of the vSphere product suite developed and Proprietary software platform of VMware. A hypervisor is a piece of software that creates and runs virtual machines. Its Type-1 Hypervisor which allows to virtualize the Data center.

What is Type 1 Hypervisors?

It’s called bare metal hypervisors, Type 1 hypervisors run directly on the system hardware. A guest operating-system runs on another level above the hypervisor. VMware ESXi is a Type 1 hypervisor that runs on the host server hardware without an underlying operating system.

ESXi provides a virtualization layer that abstracts the CPU, storage, memory and networking resources of the physical host into multiple virtual machines. That means that applications running in virtual machines can access these resources without direct access to the underlying hardware. VMware refers to the hypervisor used by VMware ESXi as vmkernel. vmkernel receives requests from virtual machines for resources and presents the requests to the physical hardware.

Here are the ESXi Versions:

ESXi 4.1, 5.0,5.1,5.5 and 6.0

Click here to check the ESXi builds.

ESXi Architecture:


ESXi is supported on Intel processors (Xeon and above) and AMD Opteron processors. ESXi includes a 64-bit VMkernel and hosts with 32-bit-only processors are not supported. However, both 32-bit and 64-bit guest operating systems are supported. ESXi supports up to 4,096 virtual processors per host, 480 logical CPUs per host, 2048 virtual machines per host and up 4 TB of RAM per host.

ESXi can be installed on a hard disk, USB device, or SD card. It has an ultralight footprint of approximately 144 MB for increased security and reliability.

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