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 | Publish Date | Comments |
---|---|---|
1.0 |
16-Jun-15 |
Initial Release |
10.0 |
13-Oct-17 |
Migration to new field notice system |
10.1 |
13-Feb-18 |
Updated to Correct Formatting and Defect Information |
10.2 |
21-May-18 |
Fixed Broken Image Links |
Affected Product ID | Comments |
---|---|
CBI-PSU-2500ACPL |
|
UCSB-PSU-2500ACPL |
|
UCSB-PSU-2500ACPL= |
Defect ID | Headline |
---|---|
CSCvf34445 | There were no defects filed with this field notice at the time of publication. |
Certain Unified Computing System (UCS) B-Series chassis power supplies have an issue which can cause shutdown when activated in a redundancy switchover. Affected units can be identified by the version and serial number format.
Affected power supplies have an issue which causes a transient overvoltage on the 3.3v bus upon power-up of parallel units which causes a reset. If the other power supplies in the active set cannot handle the required current, they will also be shut down. The resultant effect is a failure of power redundancy. This issue affects only version 01 and 02 power supplies with the serial number prefix "AZS". A modification has been implemented which changes a resistor value to prevent the overvoltage event on the 3.3v bus.
There are no symptoms exhibited during normal operation. If an affected unit is part of a redundant set, the chassis might completely shut down when a switchover is made. The amber failure indicator will light on power supplies which reset due to either the 3.3v issue or to overcurrent because of adjacent power supply shutdown.
Affected units should be replaced. The special ordering process originally associated with this Field Notice has been discontinued. Please use standard RMA process for any needed replacements.
See the How to Identify Affected Products section for instructions on how to determine if your power supply is affected by this issue.
A power supply is affected by this issue if all of these factors apply:
A power supply is not affected if one or more of these factors apply:
The steps to determine affected power supplies within a UCS B-Series chassis are as follows:
Example:
Remote Identification
In remote management situations where physical inspection is not possible, a user can determine the VID with a show tech-support process. This process can identify units with an affected VID, but cannot identify good units in that category which have deviation labels. Physical inspection will always be necessary for units which cannot be determined as good by other means. Due to the UCSM display bug noted above, the VID displayed cannot be assumed as correct. The serial number information is not affected by the display bug, so can be used as a reliable method to determine unaffected units as long as the date code matches the criteria noted above. Steps to determine the VID through a show tech-support command are as follows:
There will be up to four files with the name "ps*.fru". Each file represents one of the installed power supplies. For each of the ps*.fru files, enter the strings command to read the contents:
strings -n 3 -o <filename>
This MS Windows Example shows Company, PID, Part Number, Serial Number, and Version in that order:
A software fix for Cisco bug ID CSCuf03602 was released for UCS Infrastructure Software versions 2.0(5c) and 2.1(1f). If the software is at this level or later, it is possible to read the power supply information via the command line interface after you log into the UCS cluster via SSH. This command sequence is valid with these software versions:
show chassis inventory (Shows which chassis are in the cluster)
connect iom <chassis-num> (Do this for each chassis)
show platform software cmcctrl fru psu (This command is not available with earlier versions)
D133907 indicates screened units.
D134186 indicates units reworked by Emerson before ECO.
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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