VMware has successfully tested the live migration of a VM hosting an instance of SQL Server without impact to the workload. Customer-specific experiences may vary due to different VM sizes, workload patterns, and connection-dependent bandwidth. It’s recommended that customers test their own live migrations with non-production systems first, or with systems with less strict SLAs. Some workloads may be candidates for live migration while others may be cold migrated (requiring some downtime). The demo of the Migration of SQL Server workload can be found here.