Both vSphere and Hyper-V offer a capability to move running virtual machines and storage in a single operation, but virtual disks on local storage cannot be protected by HA.
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Working together with Intel and Dell, VMware demonstrated vMotion with SR-IOV on ESX in 2009.
The next version of Hyper-V, part of Windows Server 2012, purportedly performs "unlimited" concurrent live migrations.
Side-by-side tests show that VMware vMotion is over 5 times faster than Hyper-V Live Migration. Plus, vMotion is more reliable and protects application SLAs much better than Hyper-V.
Microsoft Virtualization publishes an embarrassing guest post refuting vSphere advantages, doing more harm than good.
According to Microsoft's own documentation, integrating SCOM with SCVMM adds high complexity and additional cost to your virtualization environment.
Because of the extra configuration -- and tools -- needed to deploy a complete Hyper-V R2 solution, eWeek concludes that VMware ESX/VMotion is simpler than Live Migration.
When a Hyper-V virtual machine console is connected and a live migration is initiated -- automatically with PRO Tips or manually -- the remote client disconnects. The situation must be resolved manually by the administrator, unlike VMware ESX, which seamlessly migrates remote console connections during VMotion.