Recommendations for high availability and disaster recovery in the virtualized SharePoint environment
Plan for availability: Microsoft TechNet provides detailed guidance on ensuring the availability of physical SharePoint farm. This has been documented extensively here. This guidance also applies to virtualized environments. Additionally consider host machine clustering and management tools as discussed below.
Virtual Machine Clustering: Additionally Windows 2008 provides a feature called “Failover clustering” that enables you to cluster host servers together, in an active passive mode. This allows virtual machines on the active host to failover to the passive host when the active host fails. This adds an entire new dimension to availability in virtualized scenarios.
System Center Virtual Machine Manager 2008 : System Centre Virtual Machine Manager 2008 provides management features to add easily add capacity to existing SharePoint farm. It has some fantastic P2V features that enable you to turn your physical farm into a virtual farm. This feature can be very useful when you need to setup a disaster recovery farm, or provisioning QA or test farms.