SPARC M8 and SPARC M7 Series Servers : Environmental information

Asset ID:	1-79-2177482.1
Update Date:	2017-10-11
Keywords:

Solution Type Predictive Self-Healing Sure

Solution 2177482.1 : SPARC M8 and SPARC M7 Series Servers : Environmental information

Applies to:

Oracle SuperCluster M7 Hardware - Version All Versions and later
SPARC M8-8 - Version All Versions and later
SPARC M7-8 - Version All Versions and later
SPARC M7-16 - Version All Versions and later
Information in this document applies to any platform.

Purpose

The goal of this document is to provide environmental information about the SPARC M8 and SPARC M7 Series Servers.

Details

Environmental Requirements

For information about the environmental requirements, please refer to the

Fan Speed Control

The control software will measure temperature from sensors throughout each cooling zone and adjust the air flow of the fans in the cooling zone by either increasing or decreasing the duty cycle of the pulse width modulated output (PWM).

Fan speed is controlled by the Service Processor, and will be a function of ambient temperature, device temperature, and exhaust air temperature. Service processor will set fan speed based on temperature data. Fan speed in each cooling zone will have a minimum speed setting for each ambient temperature range and altitude range. IFC (Intelligent Fan Control) contains two values for all the temperature sensors in the fan control loop, one is low limit, another one is high limit. These value can be varied among sensors. When all temperatures are below their own low limit, fan speed will operate at min. speed. When one of temperatures is above their own high limit, fan speed will increase up to 100% PWM. When all sensor temperatures are within low and high limits, fan speed will be at the normal state.

Fan speed settings at various ambient temperatures are

	CMIOU Chassis						Switch Chassis
	CMIOU Cooling Zones			PSU/SP cooling Zone			SWU cooling zones			PSU/SP cooling Zone
Conditions (sea level)	Min PWM (%)	80 mm fans, rpm		Min PWM (%)	PSU fans, rpm		Min PWM (%)	40 mm fans, rpm		Min PWM (%)	PSU fans, rpm
		front	rear		front	rear		front	rear		front	rear
Tamb <= 25C	70	8500	7300	50	10300	9700	35	8700	7300	70	14400	13600
25C<Tamb<=30C	80	9800	8400	60	12400	11700	40	9400	7900	80	16500	15600
30C<Tamb<=35C	100	12000	10500	80	16500	15600	45	10100	8500	100	18600	17000
Tamb, > 35C	100	12000	10500	100	18600	17000	60	12200	10300	100	18600	17000
Minimum Fan Speeds (fan failed below these speeds)		2500	2300					5200	4300

Minimum PWM values at different combinations of ambient temperature and altitude

Using the same minimum fan speed per Tamb range as described above

	CMIOU Chassis		Switch chassis
	CMIOU Cooling Zones	PSU/SP cooling Zone	SWU cooling zones	PSU/SP cooling Zone
Tamb range	Min PWM (%)	Min PWM (%)	Min PWM (%)	Min PWM (%)
T1	70	50	35	70
T2	80	60	40	80
T3	100	80	45	100
T4	100	100	60	100

the various Tamb ranges depending on the altitude are

	Altitude
Tamb Range	0-500m	501-1000m	1001-1500m	1501-3000m
T1	amb<=25C	25C<Tamb<=30C	30C<Tamb<=35C	Tamb>35C
T2	amb<=23C	23C<Tamb<=28C	28C<Tamb<=33C	Tamb>33C
T3	amb<=21C	21C<Tamb<=26C	26C<Tamb<=31C	Tamb>31C
T4	amb<=19C	19C<Tamb<=24C	24C<Tamb<=29C	Tamb>29C

Note that these are the minimum fan speeds at those Tamb and altitude combinations, but fan speeds could be higher than these values, depending on the temperatures of the devices (CPU, DIMMs, etc) and regardless of Tamb and altitude.

The ambient temperature can be checked from the Active SP using

-> show /SYS/T_AMB value

/SYS/T_AMB
Properties:
value = 21.666 degree C

The fans speed can be checked from the Active SP using

SPARC M7 and M8 processors support DVFS. Besides running the fans at higher speed via adjusting the throttling thresholds, the system may also reduce voltages and frequencies. This too will control power dissipation within desired temperature limits.

Attachments

This solution has no attachment