CHW-3318: PSU unit shows sensors "not-available" before and after replacement. PSU is confirmed to be good

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Views:: 20

Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: hw

Last Updated:

Issue

The PSU2 unit reports "not-available" sensors when attempting to retrieve system sensors information from BMC and ONTAP prompts.

When reviewing the outputs for system sensors of the affected node it shows the PSU sensors as being "not-available":

BMC affected-node-name> system sensors show
PSU1:
PSU1_Status      | 0x0        | discrete   | Ready      | na | na        | na        | na
PSU1_12V_IOUT    | 32.000     | Amps       | ok         | 0.000     | 0.000     | 165.000   | 173.000
PSU1_12V_VOUT    | 12.060     | Volts      | ok         | 10.980    | 11.400    | 12.900    | 13.500
PSU1_IIN         | 1.800      | Amps       | ok         | 0.000     | 0.000     | 14.100    | 15.000
PSU1_PIN         | 424.000    | Watts      | ok       | na        | na        | na        | na
PSU1_POUT        | 392.000    | Watts      | ok         | na        | na        | na        | na
PSU1_Type        | 2.000      | unspecified | ok         | na        | na        | na        | na
PSU1_VIN         | 228.000    | Volts      | ok         | 84.000    | 90.000    | 264.000   | 276.000
PSU2:
PSU2_Status      | na         | discrete   | na         | na        | na        | na        | na
PSU2_12V_IOUT    | na         | Amps       | na         | 0.000     | 0.000     | 165.000   | 173.000
PSU2_12V_VOUT    | na         | Volts      | na         | 10.980    | 11.400    | 12.900    | 13.500
PSU2_IIN         | na         | Amps       | na         | 0.000     | 0.000     | 14.100    | 15.000
PSU2_PIN         | na       | Watts      | na         | na        | na        | na        | na
PSU2_POUT        | na         | Watts      | na         | na        | na        | na        | na
PSU2_Type        | na         | unspecified | na         | na        | na        | na | na
PSU2_VIN         | na         | Volts      | na         | 84.000    | 90.000    | 264.000   | 276.000

::> system node environment sensors show -node affected-node-name  -state !normal
Node Sensor                 State Value/Units Crit-Low Warn-Low Warn-Hi Crit-Hi
---- --------------------- ------ ----------- -------- -------- ------- -------
affected-node-name
     PSU2 Present          not-available
     PSU2 Output OK        not-available
     PSU2 Input OK         not-available
     PSU2 In Volt          not-available
                                        - mV     84000    90000  264000  276000
     PSU2 In Curr          not-available
                                        - mA         0        -   14100   15000
     PSU2 12V Out Volt     not-available
                                        - mV     10980    11400   12900   13500
     PSU2 12V Out Curr     not-available
                                        - mA         0        -  165000  173000
     PSU2 In Pwr           not-available
                                        - W          -        -       -       -
     PSU2 Out Pwr          not-available
                                        - W          -        -       -       -
     PSU2 Type             not-available
10 entries were displayed.

Replacement PSU continues to display the same results
System Health commands show the cluster as healthy
Swapping PSU with a known-working unit from partner node indicates that the both PSU units are good, but the error remains in the PSU slot.