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Output power is not restored when the input power feed is interrupted on affected Unified Computing System (UCS) B-Series DC chassis power supplies.
Output power is not restored after the input feed of an affected UCS B-Series DC chassis power supply is removed and restored. The unit appears in UCS Manager as present, but the status is shown as Not Ok. This problem is due to a firmware issue in the power supply. The power supply firmware is not field-upgradeable, so affected power supplies should be replaced with updated units. Refer to Cisco bug ID CSCuc47311.
After input power feed is interrupted, the output power is not present, and the amber Fail Indicator LED is lit on the power supply.
Short term workaround: Reseat the power supply. Turn off the power to the individual power supply and loosen the retaining screws. Slide the power supply out a short distance until it unplugs from the backplane and wait 10 seconds. Then slide the power supply back into its slot, tighten the retaining screws, and turn the power back on.
Long term solution: Replace the power supply. The proactive replacement program for this Field Notice has been closed, however replacements can be acquired via standard RMA. If you require replacement power supplies for this issue, contact the Cisco Technical Assistance Center (TAC) and reference Field Notice 63587 when you request an RMA.
How To Identify Affected Products
Some UCS B-Series Blade Server chassis power supplies have been upgraded with corrected firmware. These units are marked with a deviation label D131186 as shown here:
Units with the deviation label have the corrected firmware, but display as Version ID (VID) 01 in UCS Manager.
UCS B-Series chassis power supplies that display VID 02 in the UCS Manager have the corrected firmware. VID 02 is reflected in the part number 341-0408-02 which is visible through UCSM or the power supply label. An example is shown here:
Note: Earlier versions of UCS Manager have a display bug, Cisco bug ID CSCuf03602, which can cause false display of VID 01 for this power supply regardless of the actual version. The issue is fixed in UCS Manager Releases 2.0(5c), 2.1(1f), and 2.2(1b).
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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