Asus AP1720-E1 User Guide - Page 46

2.9.2 SCSI backplane connections The SCSI backplane has four 68-pin SCSI connectors to support SCA SCSI hard disks. The backplane design incorporates a hot swap feature to allow easy connection or removal of SCSI hard disks. The LEDs on the backplane connect to the front panel LEDs to indicate HDD access, HDD failure, thermal failure, or fan failure. See section "1.6 LED information." Front side The front side of the SCSI backplane faces the front panel when installed. This side includes four SCSI connectors for the hot swap drive trays. First backplane Disk drive 1 SCSI ID = 0 HDD status LEDs Disk drive 2 SCSI ID = 1 Disk drive 3 SCSI ID = 2 HDD activity LEDs Disk drive 4 SCSI ID = 3 If your barebone server supports a hot swap configuration for eight (8) hard disks, a second SCSI backplane comes with the system to connect drives 5 to 8. Second backplane Disk drive 5 SCSI ID = 4 HDD status LEDs Disk drive 6 SCSI ID = 5 Disk drive 7 SCSI ID = 6 HDD activity LEDs Disk drive 8 SCSI ID = 8 SCSI ID7 is reserved for the SCSI card. 2-30 Chapter 2: Hardware setup