My mistake.  The drivers were included.  The missing storage driver was for another controller.
According to this document: [URL] PE 2900 storage drivers are included within Windows Server 2012, however this is not the case for me.  There is also a comment on this page: [URL] from 'box293' who reports a similiar issue for his PE 1955, which I think use the same drivers.  I believe I'm using a PERC 5/i Where can I get the necessary drivers? 
PE 2900 - Missing Storage Drivers - Windows Server 2012