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Part 2: The 32-Bit/64-Bit Drivers : The SQL Server Wire Protocol Driver : Connection Option Descriptions : Failover Mode
  
Failover Mode
Attribute
FailoverMode (FM)
Purpose
Specifies the type of failover method the driver uses.
The Alternate Servers option specifies one or multiple alternate servers for failover and is required for all failover methods.
Valid Values
0 | 1 | 2
Behavior
If set to 0 (Connection), the driver provides failover protection for new connections only.
If set to 1 (Extended Connection), the driver provides failover protection for new and lost connections, but not any work in progress.
If set to 2 (Select), the driver provides failover protection for new and lost connections. In addition, it preserves the state of work performed by the last Select statement executed.
Notes
*This connection option can affect performance.
Default
0 (Connection)
GUI Tab
Failover tab
See Also
See Performance Considerations for details.