3 RAID Group in Dell PE R900

Hi

Our Respected customer need One server Dell PE R900 Server with below 3 RAID Groups.  He don't want to buy external storage.

Database Server:
================
1-  Two HDD reserve for Operating System   (RAID-1)    2 x 146GB SAS 2.5-inch
2-  Two HDD reserve for Log Files                  (RAID-1)    2 x 146GB SAS 2.5-inch
3-  Four HDD reseve for Databse                    (RAID-5)    4 X 300GB SAS 2.5-inch

My question is . . . . . . . Can I go for above soluation?

Waiting for your swift response.

Thanks & Regards

Asim Sami