Steps : How to add node to SQL Server Failover Cluster from SQL Server 2008 onwards ?

1) Open SQL Server Installation Center > Click Installation from Left > Click Add node to a SQL Server Failover Cluster from right

2) Click Run to start setup

3) Click Ok to cont., In case of any failure, you need to fix that first

4) Enter Product Key & click Next

5) Accept EULA & Click Next

6) Click Install to install setup files

7) Click Next, In case of any failure, you need to fix that first

8) Enter Product Key & Click Next

9) Accept EULA & Click Next

10) Select SQL instance to add node

11) Enter Service account password & Click Next. You cannot change service account here, it must be same as existing setup

12) Click Next after Error reporting option

13) Check Setup Rules & click Next. In case of any failure, you need to fix that first

14) Check Configuration & Click install to start installation

15) Installation in progress

16) Installation completed successfully

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Reference : Rohit Garg (http://mssqlfun.com/)