Short answer: CSCwj01478 is a Cisco UCS Manager bug. A UCSX-9508 chassis with 6454 Fabric Interconnects and 9108 25G IFMs shows its PSUs as “Power: Error” and “Input Source: Unknown” while the PSU LEDs are green. The major faults stay even after the chassis is decommissioned and re-acknowledged. The first affected bundle is 4.3(2b)A, and Cisco’s workaround is to reboot the primary IFM. The bug is fixed in 4.3(4a). Because 4.3(4a) to 4.3(4d) are deprecated, upgrade to 4.3(4e) or later.
CSCwj01478 symptom
According to the UCS Manager 4.3 release notes, the problem appears “during the deployment of Cisco UCSX-9508 chassis equipped with Cisco UCS 6454 FI and Cisco UCS 9108 25G Intelligent Fabric Module (IFM) with Cisco UCS Manager integration”. What you see:
- In the chassis PSU view in UCS Manager: Power: Error and Input Source: Unknown.
- On the chassis itself: the PSU LEDs are green and the power supplies work normally.
- Major PSU faults in UCS Manager do not clear, even after you decommission and re-acknowledge the chassis.
The problem is in how the status is reported, not in the power supplies. Its real cost is operational: a permanent major fault hides real alarms, breaks clean health checks, and can get in the way of automation that waits for a fault-free domain.
Affected and fixed releases
| Item | Value (UCS Manager 4.3 release notes) |
|---|---|
| Defect ID | CSCwj01478 |
| First bundle affected | 4.3(2b)A |
| Listed as open | Open Caveats for Release 4.3(3a) |
| Documented workaround | Reboot the primary IFM |
| Resolved in | 4.3(4a) (Resolved Caveats in Release 4.3(4a)) |
| Hardware | UCSX-9508 chassis, UCS 6454 FI, UCS 9108 25G IFM, UCS Manager managed |
An earlier version of this post called it a “4.3(4a) bug”. That was wrong. 4.3(4a) is the release that fixes it, and the bug affects 4.3(2b) and later 4.3 releases before 4.3(4a).
Workarounds
- Cisco’s workaround: reboot the primary IFM of the affected chassis. Do it in a maintenance window, and first check that the servers in the chassis have working paths through both fabrics.
- What worked for me: before the fix, I set the chassis fan policy to Max, which cleared the status for a while. This is not in Cisco’s documentation. Treat it as a temporary lab observation, not a fix.
Fix: which release to upgrade to
The fix is in 4.3(4a), but Cisco has since deprecated 4.3(4a), 4.3(4b), 4.3(4c) and 4.3(4d) and removed their firmware files (see FN74201 and FN74209). Cisco recommends 4.3(4e) or later. The newest 4.3 maintenance release in the release notes is currently 4.3(6j). After the infrastructure upgrade, check the chassis PSU view and the fault list.
Sources
- Release Notes for Cisco UCS Manager, Release 4.3 (Resolved Caveats in Release 4.3(4a), Open Caveats for Release 4.3(3a), Deprecation Notice)
- Cisco Bug Search Tool: CSCwj01478 (Cisco.com login required)
- FN74201 and FN74209
Related on vdan.cz
- Cisco UCS 4.3(5a) security fixes
- UCSM 4.3(4a) VMware-v2 adapter policy for Cisco VIC
- UCS Manager CLI interactive mindmap: chassis, PSU and fault commands and every other UCSM CLI scope from Cisco’s CLI guides
