| Asset ID: |
1-72-1352782.1 |
| Update Date: | 2011-08-29 |
| Keywords: | |
Solution Type
Problem Resolution Sure
Solution
1352782.1
:
Excessive PSU temperatures on Sun Fire 4800 and E4900 servers
| Related Items |
- Sun Fire E4900 Server
- Sun Fire 4800 Server
|
| Related Categories |
- PLA-Support>Sun Systems>SPARC>Enterprise>SN-SPARC: Exx00
- .Old GCS Categories>Sun Microsystems>Servers>Midrange Servers
|
Applies to:
Sun Fire 4800 Server - Version: Not Applicable to Not Applicable - Release: N/A to N/A
Sun Fire E4900 Server - Version: Not Applicable to Not Applicable [Release: N/A to N/A]
Information in this document applies to any platform.
Symptoms
Elevated PSU temperatures which are not a result of high ambient temperatures or internal PSU fan failures.
WARNING: PS2 temperature is elevated indicating it may have a failed cooling fan.
PS2 48 VDC 0 Temp. 0 value: 54 Degrees C
Contact Oracle Support Services to check for PSU fan failure.
Cause
Excessive PSU temperatures on Sun Fire 4800 and E4900 servers are usually the result of high ambient air temperature in the area in front of the server or internal PSU fan failures. If ambient air temperatures are not excessive and replacement of the PSUs for internal PSU fan failures do not resolve the problem, the PSU air plenum at the base of the server may require cleaning.
Solution
You'll need to book a 90 minute platform outage to vacuum out the lower plenum. We may as well check the main air plenum just above the PSU plenum at the same time and vacuum out any dust bunnies seen there as well.
The main airflow and PSU airflow is shown on page 2 of:
Thermal Guidelines for Mounting Sun FireTM 4810/4800/3800 Systems in a Non-Sun CabinetYou will need an inspection mirror, a powerful but small flashlight, and an ESD safe vacuum with a long flexible wand.
- Power down the server. Switch off the three breakers at the AC power conveyance tray. Record the location of each of the three power cords and unplug them.
- Remove the AC tray. The top surface of the AC tray forms part of the lower main air supply plenum. It is possible that the label on top of the AC tray has come lose and is clogging the bottom part of the main air supply plenum. Remove and discard the label if this is the case.
- Remove the top front purple snap-in plastic cover and all three fan trays. Remove both EMI honeycomb filters and wash out in a sink. Wave them around a bit to shake out excess water. They will be dry enough by the time the server is powered up again.
- Check the main air plenum for obstructions and vacuum out any dust or debris. It runs from the front honeycomb intake, reflects down over the top of the three system bards, through FT2, across to FT0, up through the RPs and I/O boats, through FT1, and out the rear honeycomb EMI gasket.
- Remove front door. Vacuum out any dust or debris.
- If this is a rack mounted system, check for any debris or obstructions preventing clear airflow through front and rear rack doors. Check that all rotors of Sun Fire Rack fan trays are active and that there is no obstruction of airflow out the top of the rack.
- Remove all three PSUs and, the lower PSU guide plate, and the lower outside purple snap in plastic accordion cover on the front of the server. Using the inspection mirror and small flashlight, check for debris in the lower PSU plenum. With the outer snap in accordion cover removed, you should be able to peek through some small holes at the base of the chassis and see all the way through to the perforations at the base of the rear of the server.
- Clear away any items obstructing the perforated PSU exhaust plenum at the base of the rear of the server.
- Using an ESD safe vacuum, remove all dust and debris in the lower PSU plenum. Also suck out any dust visible through the air grilles on each of the PSUs.
- Reassemble and power up the server.
References
<NOTE:1001307.1> - Power Supply Fan failures can occur without notification in Sun Fire 3800, 4800, 4810, and 6800 Systems.
Attachments
This solution has no attachment
