- A [!INCLUDE[ssNoVersion](../../../includes/ssnoversion-md.md)] FCI runs in a WSFC resource group. Each node in the resource group maintains a synchronized copy of the configuration settings and check-pointed registry keys to ensure full functionality of the FCI after a failover, and only one of the nodes in the cluster owns the resource group at a time (the active node). The WSFC service manages the server cluster, quorum configuration, failover policy, and failover operations, as well as the VNN and virtual IP addresses for the FCI. In case of a failure (hardware failures, operating system failures, application or service failures) or a planned upgrade, the resource group ownership is moved to another node in the FCI.The number of nodes that are supported in a WSFC resource group depends on your [!INCLUDE[ssNoVersion](../../../includes/ssnoversion-md.md)] edition. Also, the same WSFC cluster can run multiple FCIs (multiple resource groups), depending on your hardware capacity, such as CPUs, memory, and number of disks.
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