PowerEdge: SYS565 Memory Module Temperature Warnings with Power Supply Cold Redundancy Enabled
Summary: Dell PowerEdge 17G servers added MEMHOT error monitoring in iDRAC10 firmware version 1.20.80.50 combined with supported Field-Programmable Gate Array (FPGA) firmware. Servers configured with Power Supply Cold Redundancy feature enabled can record random SYS565 memory temperature warning events. ...
Symptoms
Cold Redundancy and Cold Redundancy Power Supply Unit (PSU) Rotation policies are set to optimize input power consumption without jeopardizing the redundancy policy. The Cold Redundancy policy allows the backup PSU to remain inactive until the primary PSU fails. The
Cold Redundancy PSU Rotation policy switches between the cold redundant PSU and the active PSU every 24 hours. SYS565 events can occur during server cold boot or during Cold Redundancy PSU Rotation while the Cold Redundancy feature is enabled.
Lifecycle Log Example:
2025-10-22 17:15:35 SYS566 The memory module temperature has returned to its normal value.
2025-10-22 17:13:44 SYS565 The memory module temperature has exceeded the warning threshold value.
System Event Log Example:
The memory module temperature has returned to its normal value. Wed Oct 22 2025 17:15:34
The memory module temperature has exceeded the warning threshold value. Wed Oct 22 2025 17:13:44
MEMHOT sensor support was added to Dell 17G PowerEdge Intel servers in the following firmware releases:
- R470/R570 FPGA Version: 107.132.000
- R670/R770 FPGA Version: 108.124.104
- iDRAC10 Version: 1.20.70.50
Cause
After updating to the supported firmware versions to support MEMHOT, the cold redundancy traffic to PSUs may inadvertently trigger the MEMHOT sensor to assert.
Resolution
The March 2026 firmware versions of FPGA and iDRAC10 correct the conditions that trigger these false MEMHOT assertions.
- R470/R570 FPGA Version: TBD
- R670/R770 FPGA Version: 109.126.104
- iDRAC10 Version: 1.30.10.50
Workaround:
Disabling Power Supply Cold Redundancy within the iDRAC10 controller prevents these false positive SYS565 events from occurring.
iDRAC10 UI >> Configuration >> Power Management >> Power Configuration Example:
RACADM Example:
racadm>>racadm set system.serverpwr.coldredundancy False Object value modified successfully
REDFISH PATCH Example:
curl -sk -X PATCH -H "Content-Type: application/json" -u 'root:calvin' https://iDRAC_IP/redfish/v1/Chassis/System.Embedded.1/PowerSubsystem -d '{"Oem" :{"Dell" :{"PowerSubsystemColdRedundancy": {"ColdRedunancyEnable": false}}}}'