6.0

Virtual Machine Hardware Versions
The hardware version of a virtual machine reflects the virtual machine's supported virtual hardware
features. These features correspond to the physical hardware available on the ESXi host on which you create
the virtual machine. Virtual hardware features include BIOS and EFI, available virtual PCI slots, maximum
number of CPUs, maximum memory configuration, and other characteristics typical to hardware.
When you create a virtual machine, you can accept the default hardware version, which corresponds to the
host on which you create the virtual machine, or an earlier version. You can use an earlier hardware version
in the following situations:
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To standardize testing and deployment in your virtual environment.
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If you do not need the capabilities of the newer version.
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To maintain compatibility with older hosts.
Virtual machines with hardware versions earlier than version 11 can run on ESXi 6.0 hosts, but do not have
all the capabilities available in hardware version 11. For example, you cannot use 128 virtual processors or
4080GB of memory in virtual machines with hardware versions earlier than version 11.
The vSphere Web Client and the vSphere Client allows you to upgrade virtual machines only to the latest
hardware version. If virtual machines do not have to stay compatible with older ESX/ESXi hosts, you can
upgrade them on ESXi 6.0 hosts. In this case, they are upgraded to version 11.
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To maintain virtual machine compatibility with ESX/ESXi 3.5 hosts, upgrade the virtual machine on an
ESX/ESXi 3.5 host, which results in a virtual machine upgrade to version 4.
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To maintain virtual machine compatibility with ESX/ESXi 4.x hosts, upgrade the virtual machine on an
ESX/ESXi 4.x host, which results in a virtual machine upgrade to version 7.
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To maintain virtual machine compatibility with ESXi 5.0 hosts, upgrade the virtual machine on an
ESX/ESXi 5.0 host, which results in a virtual machine upgrade to version 8.
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To maintain virtual machine compatibility with ESXi 5.1 hosts, upgrade the virtual machine on an
ESX/ESXi 5.1 host, which results in a virtual machine upgrade to version 9.
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To maintain virtual machine compatibility with ESXi 5.5 hosts, upgrade the virtual machine on an
ESX/ESXi 5.5 host, which results in a virtual machine upgrade to version 10.
A virtual machine can have an earlier hardware version than that of the host on which it runs in the
following cases:
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You migrate a virtual machine created on an ESX/ESXi 4.x or earlier host to an ESXi 5.0 host.
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You create a virtual machine on an ESXi 5.0 host by using an existing virtual disk that was created on
an ESX/ESXi 4.x or earlier host.
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You add a virtual disk created on an ESX/ESXi 4.x or earlier host to a virtual machine created on an
ESXi 5.0 host.
You can create, edit, and run different virtual machine versions on a host if the host supports that version.
Sometimes, virtual machine actions on a host are limited or the virtual machine has no access to the host.
Chapter 15 Configuring Virtual Machines in the vSphere Client
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