In a production environment, we recommend that you use static IP addresses in conjunction the virtual IP address of a Failover Cluster Instance. Throttled resource usage during failovers Reliable failovers through periodic and detailed health detection using dedicated and persisted connectionsĬonfigurability and predictability in failover time through indirect background checkpoints Zero reconfiguration of applications and clients during failoversįlexible failover policy for granular trigger events for automatic failovers With the new multi-subnet support in Microsoft SQL Server 2012 (11.x), a multi-subnet FCI no longer requires a virtual LAN, increasing the manageability and security of a multi-subnet FCI. Support for a broad array of storage solutions, including WSFC cluster disks (iSCSI, Fiber Channel, and so on) and server message block (SMB) file shares.ĭisaster recovery solution using a multi-subnet FCI or running an FCI-hosted database inside an availability group. However, this coupling can be made for your disaster recovery solution. This means that FCIs and standalone nodes should not be coupled together within an availability group if automatic failover is an important component your high availability solution. ![]() ![]() In an availability group, automatic failover from an FCI to other nodes within the availability group is not supported. Protection at the instance level through redundancyĪutomatic failover in the event of a failure (hardware failures, operating system failures, application or service failures) The following lists some key benefits that SQL Server failover cluster instances provide: This process is transparent to the client or application connecting to SQL Server and this minimizes the downtime the application or clients experience during a failure. 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 WSFC node. ![]() Only one of the nodes in the FCI owns the WSFC resource group at a time. When a SQL Server instance is configured to be an FCI (instead of a standalone instance), the high availability of that SQL Server instance is protected by the presence of redundant nodes in the FCI. When there is hardware or software failure of a server, the applications or clients connecting to the server will experience downtime. For more information, see Understanding Cluster Shared Volumes in a Failover Cluster. For more information, see Storage Spaces Direct in Windows Server.įailover Cluster Instances also support Clustered Shared Volumes (CSV). SQL Server Failover Cluster Instances support S2D for cluster storage resources. Windows Server 2016 Datacenter edition introduces support for Storage Spaces Direct (S2D).
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