HP DL380 for Intense Database Processing

[RahulT]

I'd like to build out an HP DL380 G9 server for intense database processing. I'd like to use a mix of SSDs and HDDs and here is my design. Can someone please comment on the validity? My entire database is less than 3TB but I want to allow for future growth.

HP DL380 G9

2* Xeon E5-2698 v4 CPU

32GB * 24 = 768 GB DDR4 RAM

P840 Array controller

2* 1 TB HDD (for the OS)

4* 1.2 TB SATA SSD (for the database) (Should this be SATA, SAS, or PCIe?)

6* 4 TB 7200 HDD (for the software and database backup)