Intel JBOD 2000 Hardware Manual page 31

Intel® Storage Server System JBOD 2000 Family Hardware Guide
Optional 2x12-pin SSI and 1x5-pin SSI power control headers (for potential future use

with 4U JBOD fixed power supply).
Power for up to two internal 36-port SAS expander cards (RES2CV360R) for the 2U

JBOD with two additional connectors for future use.
Two 2x4-pin 12V power headers and an additional two 2x4-pin 12V power headers for

future use. Each cable is used to connect power to a single 12x 3.5" HSBP or up to three
8x 2.5" HSBPs.
Support for hot-swap redundant fan speed control solutions up to three system fans and

identification of fan failures at front panel fault LED indicator with communication over
SES2 interface to host PC.
SMB interface for communicating enclosure status through the expander board to the

host system external host controller via SES interface. Monitoring capabilities include:
Fan tachs
-
12V voltage out from PSU
-
12V current from PSU
-
Temperature on front panel, HDDs, and on the board behind drives
-
Ambient overtemp protection: Reported to host system and fan boost only. No
-
shutdown.
- Degraded (PSU, FAN) state reportable to host system and on JBOD status LED
The ADT7476 thermal controller on the PDB can measure and control the speed of up to three
fans. The controller provides acoustic enhancements to ensure the fans run at the lowest
possible speed for the given temperature. The controller interfaces with two remote temp
sensors and a local temp sensor built into the chip.
The thermal controller on the PDB is programmed using the SAS expander that comes with the
Intel ® Storage Server System JBOD 2000 Family. The SAS expander in the Intel
System JBOD 2000 Family uses a firmware that programs the thermal controller when the
system is turned on. If the SAS expander is not plugged into the PDB using the I
fans will run at 100% and the thermal controller will not be programmed correctly.
The cable must be connected to the I
expander board and then either of the I
on.
If the fan runs at 100% at room temperature, there is an issue with the SMBUS connection, the
SAS expander is not getting power, or the incorrect firmware is on the expander.
When a fan fails in the Intel
is set in the ADT7476 Thermal Controller that signals the fan fault (register shown below). The
LSI expander chip on the SAS expander monitors this register, and when a fan fault bit is set in
the interrupt register, this information is sent to the host system through SES. The ADT7476
controller also sends a signal out of its GPIOs to light the LED on the failed fan's hot-swap
housing which makes replacing/diagnosing the failed fan much easier.
Revision 1.42
2 C port B (Port C will not program the PDB) on the
2 C connectors on the PDB before the system is turned
®
Storage Server System JBOD 2000 Family, an interrupt register bit
Power Subsystem
® Storage
2 C cable, the
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