A list of alternate database servers that is used to failover new or lost connections, depending on the failover method selected. See FailoverMode for information about choosing a failover method.
The server name (servername1, servername2, and so on) is required for each alternate server entry. Port number (port1, port2, and so on) and connection properties (property=value) are optional for each alternate server entry. If the port is unspecified, the port number of the primary server is used. If a port number for the primary server is unspecified, a default port number of 1433 is used.
The driver allows only one optional connection property, DatabaseName.
Notes
If using failover with Microsoft Cluster Server (MSCS), which determines the alternate server for failover instead of the driver, any alternate server specified must be the same as the primary server. For example: