According to this document:
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:
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?
My mistake. The drivers were included. The missing storage driver was for another controller.
Have you already configured RAID in the CTRL-R utility? The PERC's do not support non-RAID, so RAID must be configured before the OS can see/use any drives connected to the PERC.