Don’t know what VMware VMotion is? VMotion allows you to easily move one virtual machine to another VMware ESX host that is connected to the same storage mechanism (presumably SAN) with no downtime. Looks promising 
Image courtesy of VMware
Dell has a demonstration using Microsoft SQL Server where they move the live SQL Server from one blade to another with no outage:
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There is an opensource plugin, SVMotion, that may be of some use to those people using VMotion:
Screenshot:
Short answer, yes.
I am a consultant, and have been for years, I have worked at enterprise companies, fortune 50, and the ones that run VMware (about 1/2) use it mostly BECAUSE of VMotion. HA and DRS us VMotion for their magic, and it’s an integral part of an enterprise class VMware rollout. It’s also an area that they’re years ahead of Citrix and MS with that piece of virtualization.
My 2 cents. Email me if you want names.
“atstriker2000″