Specifications

QSSC-S4R Technical Product Specification Processor Presence and Population Check
281
70
80
90 100% 80% 80%
100 100% 80% 80%
4. HSC Temp: Apart from system Fan contribution, PS Fan would boost when BP temperature crosses threshold
mentioned in clamp record. As BMC needs to poll HSC BP sensor continuously, new sensor 0xF0 has been added
and the same is clamped for Domain 4 which is same as HSC BP temp sensor 0x01.
Since the power supplies and the hard disks must always have sufficient cooling, the final power supply fan speed
RPM must be the maximum fan speed required by items 1, 2 ,3 and 4 above.
24.25.4 Power Supply Failure Management
Since the system supports several power supply configurations, this section will describe the system level fan speed
control reaction to some specific failure modes.
System Configuration refers to the initial non-failure or non-hot swap configuration. The following table is limited to rotor
failures for the power supply fans only. This is not based on any system fan failures.
System Configuration
(# of PS installed)
Description of Failure or
Event
System Reaction
4 Single rotor failure Normal
3
2
4 Any second rotor failure
or any double fault
All Power Supply fans to maximum speed
3
2
4 Hot swap operation Normal
3
2 All Power Supply fans to maximum speed
1 None All Power Supply fans to maximum speed
1 Any Fault All Power Supply fans to maximum speed
The table above is the default. System testing must be performed to validate these conditions and the specific system
reactions are subject to change based on system testing.
Note: If there is a fan fault on one PS, PMBUS FW would boost other fans on the faulty PS to 100% PWM. Even if the
fault is de-asserted, PMBUS FW would keep all fans at 100% PWM till PS is reset either by AC cycle or removing and
inserting back the PS.
24.25.5 Power Supply Status Sensors
For each power supply, the BMC supports an IPMI type 08h power supply sensor using the following offsets:
Table 186. Power Supply Sensor Offsets
Offset Description Event Logging
00h
Presence detected – Asserted if power supply module is present. Events are only logged
for power supply presence upon changes in the presence status after AC power is
applied (no events logged for initial state).
Assertion and
Deassertion
01h Power supply failure detected – Asserted if power supply module has failed.
Assertion and
Deassertion
02h
Predictive failure – Asserted if a condition that is likely to lead to a power supply module
failure has been detected, such as a failing fan.
Assertion and
Deassertion
03h Power supply AC lost – Asserted if there is no AC power input to a power supply module.
Assertion and
Deassertion
06h
Configuration error – Asserted if the BMC cannot access the server management features
due to a power supply type mismatch.
Assertion and
Deassertion