Asus P9D-MH/SAS/10G-DUAL - Manual (Page 50)

2-30 Chapter 2: Hardware information
8. LSI 2308 SAS/SATA RAID controller setting (3 pin SAS_SW1)
This jumper allows you enable or disable the LSI 2308 SAS/SATA RAID controller. Set
to pin 1-2 to enable, otherwise set to pin 2-3 to disable the LSI 2308 SAS/SATA RAID
controller.