Your servers should be identical in terms of hardware, operating system, and software. Windows Server 2012 R2 cluster, SQL server and Security Center each have their own set of minimum requirements.
The following table lists the minimum requirements as a combination of all three:
|CPU and memory||Refer to Windows Server 2012 R2 Failover Clustering hardware requirements and storage, located at: https://technet.microsoft.com/en-us/library/jj612869.aspx.|
|Operating system||This guide is based on clustering Security Center server in a Windows Server 2012 R2 environment. Windows Server 2003 and 2008 are also supported for the clustering of Security Center server.|
|Storage||External storage for Security Center server’s configuration files, database files and video archives (if the server is managing an archiver role) is required. Serial attached SCSI, Fibre channel or iSCSI are recommended.|
|Network cards||A minimum of two network cards are required. One for the public (data) network and one for the private (cluster) network. A third network card may be required for connection to the external storage.|
|SQL Server||While SQL Server Express is bundled with the Security Center installation disk, it is not supported for clustering. Instead, SQL Standard or Enterprise (2008, 2012, or 2014) must be used.|
|Database management tools||SQL Management Studio will be needed for database management. See http://www.microsoft.com/en-us/download/details.aspx?id=29062.|