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On RH2285 V2 the fans Keep Running Rapidly Due to Incorrect Connection of Front VGA Cables

Publication Date:  2018-02-13 Views:  165 Downloads:  0
Issue Description

Fans Keep Running Rapidly Due to Incorrect Connection of Front VGA Cables.

Alarm Information

RH2285 V2 server, configured with a backplane housing eight hard disks.

RH2285 V2 fans keep running about 7000 rotations per minute, and from the logs we can see below message:




Handling Process

1.Power off and restart the server, but after that the problem persists

2.Upgrade the BMC to the latest version, but the problem persists

3.Replace the mainboard, but also the problem persists.

Root Cause

The BMC contains an alarm about the rear hard disk temperature, but there is no rear hard disk nor rear hard disk backplane is installed on the current server.

The server is configured with eight hard disks and a front VGA port.

A cable is connected the REAR_HDD port numbered 45 and the front VGA board:




The front VGA cable of the faulty server is incorrectly connected. Move the other end of the VGA cable from port 45 (J141 REAR_HDD) to port 47 (J157 VGA_CARD),after that, the fans run properly, and the problem is resolved.



Connect the front VGA cable to the correct port on the mainboard. Only an 8-hard-disk server contains a front VGA port.

The incorrect connection of a VGA port on the mainboard may cause a mainboard fault.

The mis-connection of a rear hard disk port on the mainboard may cause an abnormal fan speed.