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August 29th, 2021 12:00
Question regarding redundant power supply
I have a PowerEdge T410 which comes with redundant power supply. My understanding was that with both connected, combined, the machine would draw only as much power as it needs, and would be the same if just one is connected.
But checking the sensor reading with ipmitools, it seems like the power usage (watts used) is almost double with both connected.
Readings with one PSU connected:
Current | 0.68 Amps | ok
Voltage | 118 Volts | ok
System Level | 98 Watts | ok
Power Optimized | 0x00 | ok
DKM Status | 0x00 | okWith both PSUs connected:
Current | 0.80 Amps | ok
Current | 0.80 Amps | ok
Voltage | 118 Volts | ok
Voltage | 118 Volts | ok
System Level | 189 Watts | ok
Power Optimized | 0x00 | ok
DKM Status | 0x00 | okIs my understanding correct that its using double the power, or am I reading the sensor output wrong?
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DELL-Young E
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5.3K Posts
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August 30th, 2021 01:00
Hi, thanks for choosing Dell. Is your iDRAC up to date? How about updating it?
goonerish
2 Posts
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August 30th, 2021 05:00
Hi,
Yes, iDRAC is on firmware v2.92, which I believe is the latest one. BIOS is on v1.14.0.
DELL-Charles R
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4.7K Posts
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August 30th, 2021 06:00
Hello goonerish,
Maybe this information can help.
In redundant mode, the system distributes the power load across both power supplies to maximize efficiency
Additional information - Page 21: https://dell.to/3mF9hj4
Configuration options BIOS Power Management Screen
Power Management:
Options are OS Control, Active Power Controller, Custom, or Maximum Performance. For all but the Custom setting, the BIOS pre-configures the power settings on this screen as follows:
• OS Control sets the CPU power to OS DBPM, the fan power to Minimum Power, and the memory power to Maximum Performance. In this setting, all processor performance information is passed from the system BIOS to the operating system for control. The operating system sets the processor performance based on processor utilization.
• Active Power Controller sets the CPU power to System DBPM, the fan power to Minimum Power, and the memory power to Maximum Performance. The BIOS sets the processor performance based on processor utilization.
• Maximum Performance sets all fields to Maximum Performance.
CPU Power and Performance Management:
Options are OS DBPM, System DBPM, Maximum Performance, or Minimum Power.
Fan Power and Performance Management:
Options are Maximum Performance or Minimum Power.
Memory Power and Performance Management:
Options are Maximum Performance, a specified frequency, or Minimum Power.