Almost all database workloads are now (or eventually will be) virtualized. High availability (HA) clusters using virtual servers provide the application protection needed to satisfy even the most demanding service-level agreements (SLAs).
Configuring the shared storage needed for HA in VMware can present challenges to creating these clusters and therefore satisfying SLAs. These challenges can create a barrier to migrating business-critical database applications to VMware. SQL Server also presents challenges that can make satisfying SLAs substantially more expensive.