On PTX devices we may encounter the following error messages on their system:

2 alarms currently active
Alarm time               Class  Description
2024-03-14 21:36:22 PDT  Major  PDU 0 PSM 2 Input Failed
2024-03-14 21:36:58 PDT  Minor  Zone 0 N+2 Power redundancy missing

root> show chassis alarms 
2 alarms currently active
Alarm time               Class  Description
2024-03-14 21:36:22 PDT  Major  PDU 0 PSM 2 Input Failed
2024-03-14 21:36:58 PDT  Minor  Zone 0 N+2 Power redundancy missing

> show chassis power detail | no-more 
Chassis Power        Input(V)      Used(W)
    PSM 2
      Capacity:          0 W (maximum 0 W)

> show chassis environment | no-more 
Class Item                           Status     Measurement
Power PDU 0                          OK        
      PDU 0 PSM 2                    Check     

Logs:
hwdre: HWD_ALARM_SET_NOTICE: ReportFault: Fault(Location: /Chassis[0]/Psm[2] Device: psm2 Error: psm_in_unit_off_fail) reported
hwdre: EMF_EVO_ALARM_SET: Alarm set: PSM color=red, class=CHASSIS, reason=PDU 0 PSM 2 Input Failed
hwdre: HWD_FRU_SNMP_TRAP_NOTICE: SNMP trap generated: jnxPowerSupplyInputFailure for /Chassis[0]/Psm[2]
hwdre: HWD_FRU_SNMP_TRAP_NOTICE: SNMP trap generated: jnxFruPowerOff for /Chassis[0]/Psm[2]
hwdre: HWD_PSM_MCU_STATUS_DUMP: PSM[2] MCU status dump:- status_word_upper = 0x28, status_word_lower = 0x48, status_vout = 0x0, status_iout = 0x0, status_input = 0x18, status_temp = 0x0, status_cml = 0x0, status_fan = 0x0
hwdre: HWD_PSM_DEBUG_DUMP: PSM[2] debug information:- Input voltage: 0.000000V, Input current: 0.000000Amp, Input power: 0.000000W, Output voltage: 0.000000V, Output current: 0.000000Amp, Output power: 0.000000W, Inlet Temperature: 25.000000C, Full Bridge hot spot: 17.000000C, PFC hot spot: 26.000000C,  Fan speed 1: 0.000000rpm
hwdre: HWD_ALARM_SET_NOTICE: ReportFault: Fault(Location: /Chassis[0]/Psm[2] Device: psm2 Error: psm_other_failure) reported
hwdre: HWD_PSM_MCU_STATUS_DUMP: PSM[2] MCU status dump:- status_word_upper = 0x28, status_word_lower = 0x48, status_vout = 0x0, status_iout = 0x0, status_input = 0x18, status_temp = 0x0, status_cml = 0x0, status_fan = 0x0
hwdre: HWD_PSM_DEBUG_DUMP: PSM[2] debug information:- Input voltage: 0.000000V, Input current: 0.000000Amp, Input power: 0.000000W, Output voltage: 0.000000V, Output current: 0.000000Amp, Output power: 0.000000W, Inlet Temperature: 25.000000C, Full Bridge hot spot: 17.000000C, PFC hot spot: 26.000000C,  Fan speed 1: 0.000000rpm

These errors indicate issues related to power supply and redundancy in the system. Understanding and resolving these errors is crucial for maintaining system reliability.

Possible Causes:
1. Power Supply Malfunction: The power supply unit (PSU) associated with PDU 0 PSM 2 may have encountered a failure or malfunction.
2. Power Distribution Unit (PDU) Issues: There may be issues with the power distribution unit (PDU) supplying power to the affected components.
3. Cable connected: There may be an issue with the cable attached.
4. Environmental Factors: Environmental conditions such as temperature or humidity may be impacting the performance of power-related components.

Troubleshooting Steps:
1. Verify Power Connections: Ensure that all power connections, including those from the PDU to the PSUs, are secure and properly connected.
2. Check Power Supply Health: Monitor the health status of the power supply units, particularly PDU 0 PSM 2, to identify any failures or anomalies.
3. Cable Check: Test with a different power feed and cable to isolate any potential issues.
4. Reseating the PSU: If the problem persists after testing with different power feeds and cables, attempt to reseat the PSU.
5. Swapping the PSU: If the issue persists even after reseating the PSU, try swapping the PSU to determine if the problem lies with the PSU or the slot.
6.  Inspect PDU Functionality: Evaluate the functionality of the power distribution unit (PDU) supplying power to Zone 0 to determine if there are any issues affecting power delivery.
7. Monitor Environmental Conditions: Monitor environmental conditions within the data center or server room to identify any factors that may be contributing to power-related issues on the other devices.