COOLING_UNIT_FAILURE on rx6600

[rianui]

Hello,

I have this error on my rx6600 server. I replaced a fan that was showing an amber light but it didn't help.
Attached are sysrev command output and MP logs.
Kindly assist me.

SYSREV

Current firmware revisions

MP FW : F.02.17
BMC FW : 05.23
EFI FW : ROM A 05.66, ROM B 07.12
System FW : ROM A 02.03, ROM B 04.03, Boot ROM B
PDH FW : 50.07
DHPC FW : 01.23
UCIO FW : 03.0b
PRS FW : 00.08 UpSeqRev: 0c, DownSeqRev: 08
HFC FW : 00.03 SetRev: 00



183 BMC 2 0x204A0D7F75020CA0 FFFF0007F50A0300 COOLING_UNIT_OK
15 May 2009 14:43:01
182 BMC 2 0x204A0D7F75020C90 FFFF0007F40A0300 COOLING_UNIT_OK
15 May 2009 14:43:01
181 BMC 2 0x204A0D7F75020C80 FFFF0007F30A0300 COOLING_UNIT_OK
15 May 2009 14:43:01
180 BMC *5 0x204A0D7F59020C70 FFFF0207F50A0300 COOLING_UNIT_FAILURE
15 May 2009 14:42:33
179 BMC *5 0x204A0D7F59020C60 FFFF0207F40A0300 COOLING_UNIT_FAILURE
15 May 2009 14:42:33
178 BMC *5 0x204A0D7F59020C50 FFFF0207F30A0300 COOLING_UNIT_FAILURE
15 May 2009 14:42:33


Regards,

Rianui

[Jozef_Novak]

Hello,

I think this can also be caused by a defective sensor. Have you contacted HP ? They should qualify the problem and decide which parts should eventually be replaced.

Your system and BMC firmware is slightly below the latest revision. Maybe you will be advised to update.

J.

[Steven E. Protter]

Shalom,

This system has redundant cooling fans. If you are into it, replacement of the fan itself is no harder than a CPU fan on a regular PC.

Either that or call HP hardware service.

But one fan down on this system is not a crisis. Just don't let it turn into two fans.

SEP

[rianui]

Hello Jozef,
Yes I have contacted HP and I'm waiting for a response from them. I had noted that the firmware could be an issue here but my colleague thinks otherwise. Thanks.

Steven,
I replaced one fan. My colleague still holds that there could be a multiple fan failure. Thanks too.
Also, I observed that all the fans were spinning very fast for a few moments then they would slow down and the process would repeat itself over and over, thus filling the logs with these errors.

Regards,

Rianui

[Jozef_Novak]

Hello Rianui,

the short periods of high fan speeds may point to an intermittent fan failure as well as a sensor problem.

I would see the multiple fan failure as a least likely possibility, since the system is designed with N+1 redundancy. I think two fan failures for longer perionds would have initiated a system shutdown.

Anyway, HP hardware support is the best place to contact in this situation.

HTH,
Jozef

[rianui]

Hi guys,

HP told me the problem could be faulty I/O backplane.
I will replace that and let you know how that goes.

Thanmks,

Rianui

[tkc]

COOLING_UNIT = Fan assembly with two fans inside. So there is a failure in the Fan 3, 4 and 5. Use the PS command at the MP prompt to check the status of the fans. If 3 fans failed at the same time, it is worth to check the part that supply power to these fans. there are 2 sources of power supply path in the I/O backplane. One supplying to fans 0-2 and the other 3-5. so it is likely problem with the IO backplane. If not, the next part to replace would be the pci power board.

[rianui · Accepted solution]

I replaced the I/O backplane.
Thanks!