Field Notice: FN - 63971 - UCSB-PSU-2500ACDV & UCSB-PSU-2500HVDC Power Supply Units Indicate False Issue - Software Upgrade Recommended

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Updated:October 13, 2017

Document ID:FN63971

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Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Publish Date	Comments
1.0	12-Aug-15	Initial Release
10.0	13-Oct-17	Migration to new field notice system

Products Affected

Affected Product ID	Comments
UCSB-PSU-2500ACDV=	Part Alternate
UCSB-PSU-2500ACDV
UCSB-PSU-2500HVDC
UCSB-PSU-2500HVDC=	Part Alternate

Defect Information

Defect ID	Headline
CSCus89837	IOM pwrmgr is excessively logging "error: Invalid argument"

Problem Description

Due to a software timing issue with the UCSB-PSU-2500ACDV and UCSB-PSU-2500HVDC Power Supply Unit (PSU), messages that indicate a power supply problem might inaccurately appear.

Note: This message is cosmetic.

Background

A time-out of the PSU is insufficient to accommodate the internal communication link. This results in an erroneous transaction result.

There is no functional or operational impact when the error is reported.

The updated software provides a defensive mechanism that only allows this fault to be reported after three consecutive invalid transactions.

Problem Symptom

In the IO Module (IOM) pwrmgr logs for the chassis, these error messages have been observed:

CMC NOCSN_pwrmgr-3-CMC 0:ps_get_peak_current_12V:Unable to read PS curent(12V) path:
 /sys/devices/platform/fsl-i2c.2/i2c-1/1-005c/peak_output_curr_sensor1, error:
 Invalid argument

CMC NOCSN_pwrmgr-3-CMC 0:ps_get_current_12V:Unable to read PS curent, path:
 /sys/devices/platform/fsl-i2c.2/i2c-1/1-004e/output_curr_sensor1, error:
 Invalid argument

CMC NOCSN_pwrmgr-3-CMC 0:ps_get_voltage_12V:Unable to read PS voltage 12V, path:
 /sys/devices/platform/fsl-i2c.2/i2c-1/1-005c/output_volt_sensor1, error:
 Invalid argument

On the Cisco Unified Computing Server Manager (UCSM), customers will observe a PSU fault F0391 for voltage (upper non-recoverable and lower non-recoverable).

Workaround/Solution

In order to avoid this issue, Cisco recommends that users upgrade their systems to Version 2.2(3g) or later.

Note: Version 3.0 does not have this issue.

Refer to the appropriate UCSM Install and Upgrade Guide in order to obtain information about how to upgrade the Cisco UCS B-Series servers.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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