server hard disk configuration

[wijcc]

How would you guys setup your server's hard disk configuration... would you setup two sets of RAID partitions.. one for the OS and the other for DATA, if so what RAID level would you use for each?
Or would you just use a RAID partition for both both the OS and DATA?

 

[wijcc]

The server would be running sql server, a few programs and act as network drive too. A mixtures of speed and resilience..