Disaster recovery is the set of measures you undertake when your deployment has undergone a significant failure that exceeds the capabilities of your fault tolerance. Some example scenarios that might require disaster recovery efforts include the following:
- Storage failures: For example, if your storage environment has two redundant disk controllers and both of them fail before you can return the system to full capacity, or more than one disk fails simultaneously in a RAID-5 disk volume.
- Virtual machine host failures: If your environment comprises virtual machines and the underlying virtual machine hypervisors fail in a way that prohibits the virtual machines supporting your environment from powering up.
- Software updates: This could apply to operating system updates, application platform updates, driver updates, or other application updates that render the system unusable.
- Database failure: Since the majority of SharePoint Server's services rely...