VMware's vSphere, ESX 4.0, is the final incrementation of the very popular ESX hypervisor. Just like it's previous versions, ESX 3.0, 3.5, etc, vSphere includes popular features such as HA (High Availability), DRS (Dynamic Resource Scheduling), vMotion (live migration of guests), and vStorage Motion (live migration of guests disks on datastores). vSphere brought many performance improvements to market, over previous version of ESX. All future enterprise level hypervisors from VMware will be under the ESXi product tag.

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