Asus Xeon 5U Rackmount Server AP1720-E1 - Manual (Page 46)

Chapter 2: Hardware setup 2-30
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.
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.
HDD status LEDs
HDD activity LEDs
Disk drive 1
SCSI ID = 0
Disk drive 2
SCSI ID = 1
Disk drive 3
SCSI ID = 2
Disk drive 4
SCSI ID = 3
HDD status LEDs
HDD activity LEDs
Disk drive 5
SCSI ID = 4
Disk drive 6
SCSI ID = 5
Disk drive 7
SCSI ID = 6
Disk drive 8
SCSI ID = 8
SCSI ID7 is reserved for the SCSI card.
First backplane
Second backplane