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The SCSI backplane functional blocks include the following:
• Ultra320 LVD SCSI bus passes SCSI signals between the SCSI drives and the main board
A standard 68-pin SCSI connector provides the SCSI connection from the main board to
the SCSI backplane.
Two 80-pin (SCA-2 blind-mate) connectors are located on the SCSI backplane board to
mate with hot-swap LVD SCSI drives in the drive bay.
• Fault Tolerant Enclosure Management
SAF-TE
SCSI power control
LED control logic
• Server management
I
2
C interface
I
2
C Serial CMOS EEPROM (FRU)
Temperature sensor
QLogic* GEM359* SCSI Hot-swap Controller
The QLogic GEM359 Hot-swap Controller resides on the SCSI backplane board. The primary
functions of the GEM359 are as follows:
• Implements the SAF-TE command set
• Controls the SCSI hard drive fault LEDs
• Provides a path for management information via the SCSI
• Retrieves hard drive fault status, SCSI backplane temperature, and fan failure information via
the IPMB
• Queries the status of the power distribution board by retrieving information from the BMC via
the IPMB
• Controls hard drive power-on and power-down, facilitating hot-swapping
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