Asus TS700-E6/RS8 - Manual (Page 63)

ASUS TS700-E6/RS8 4-11
4. Hard disk activity LED connector (4-pin HDLED1)
This LED connector is for the storage add-on card cable connected to
the SATA or SAS add-on card. The read or write activities of any device
connected to the SATA or SAS add-on card causes the front panel LED to
light up.
3. SAS connectors
(7-pin SAS1, SAS2, SAS3, SAS4; Red)
(7-pin SAS5, SAS6, SAS7, SAS8; Blue)
This motherboard comes with eight (8) Serial Attached SCSI (SAS)
connectors, the next-generation storage technology that supports both Serial
Attached SCSI (SAS) and Serial ATA (SATA). Each connector supports one
device.
These connectors function only when you install a PIKE RAID card.