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Excessive vibration can cause the power supply cage to wear away insulating material on the power backplane and create a short circuit on the 12v supply.
When this was tested in Manufacturing, a single unit was found to have a short circuit between the power supply cage and backplane caused by the metal wearing away the insulation on the Printed Circuit Board (PCB). The backplane PCB has been redesigned to clear all trace from the sheet-metal contact areas.
The symptoms of this problem are power supply shutdown and heat deformation at location of short. This problem also might result in server shutdown.
The power backplane should be replaced in order to avoid this issue. Open a case with the Cisco Technical Assistance Center to order one mid-plane (UCSC-PWRBP-C460=) for each affected server. Use the chassis serial number of your affected unit(s) if a serial number is requested. When the replacement part(s) have arrived, contact Cisco Technical Assistance Center (TAC) in order to schedule a Field Engineer to complete the replacement activity.
How To Identify Affected Products
Unified Computing System (UCS) C460 M4 chassis at Version ID (VID) level 03 or higher are not affected by this issue. The VID is on a label with the unit serial number, and can be found on the plastic pull-out tab on the front of the unit.
UCS C460 M4 chassis at VID level 02 and lower that have Deviation label D507196 are not affected by this issue. If the unit has a Deviation label, it can be found on the right-hand side of the chassis when you face it from the front. The unit serial number and VID are also visible in this location.
UCS C460 M4 chassis at VID level 02 or lower without Deviation D507196 are affected by this issue. These affected units are also identified by serial number. Use the FN 63907 Serial Number Validation Tool in order to enter your serial numbers and determine if you have affected unit(s).
On stand-alone units, the serial number can be collected remotely via the Cisco Integrated Management Controller (CIMC) management interface. The chassis serial number is visible in the Server Summary page as shown here:
Chassis serial number can also be retrieved via the CLI if you open a Secure Shell (SSH) connection to the unit and enter these commands:
On units managed through UCS Manager, the chassis serial number is visible on the Motherboard screen when the server is selected.
UCS C460 M4 chassis with deviation D507196 are not affected.
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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