VMware vSphere 4 Technical Information download pdf (Page 18)

Performance Best Practices for VMware vSphere 4.0

18 VMware, Inc.

 ESX 4.0 introduces virtual hardware version 7. By creating virtual machines using this hardware version,

or upgrading existing virtual machines to this version, a number of additional capabilities become

available. Some of these, such as VMXNET3 and PVSCSI, can improve performance for many workloads.

This hardware version is not compatible with previous versions of ESX, however, and thus if a cluster of

ESX hosts will contain some hosts running previous versions of ESX, the virtual machines running on

hardware version 7 will be constrained to run only on the ESX 4.0 hosts. This could limit VMotion choices

for DRS or DPM.

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VMware vSphere 4 Technical Information Page 18