indiannic
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R420 chassis heating due raid controller card

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hi

we purchased 6 servers from dell india.

we are facing a severe heating issue on top of the chassis above the raid card with all these 6 servers.

server configuration

R420 - single hexcore processor 2.2 ghz, 32gb ram

4 X 600 gb 15000 rpm drives
(configured as 2 drives in raid 1 + 2 drives in raid 1)

these servers are placed in a datacenter -- temperature is around 18 deg C

we are facing a severe heating issue at the on top of the chasiss just above the raid controller

when the servers are placed one above the other like they are normally placed in a datacenter the servers heat up between 50.4 - 57 deg celcius

dell support has changed motherboard, raid card , power supply etc of one of the above servers which is non-production (heating to 50.4 deg celcius) but the issue is not resolved

On closer examination of the raid controller card i noted that the fins of the heatsink on top of the raid controller card --  instead of being parallel to the airflow is actually perpendicular to the air flow and is actually trapping all the heat

the same card in a R620 server has the heatsink fins parallel to the air flow which remains cool

has anybody else in this forum noted this and are facing such a heating issue ?

could you please check this and let me know the resolution to this problem

can the heatsink be turned around by 90 degrees so that the fins of the heat sink are parallel to the airflow ?

thanks for your help

rajesh mahadevan

mumbai , india

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RE: R420 chassis heating due raid controller card

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the dset report displays normal temperatures since it measures the inlet temperature (26-28 deg C) and the cpu temperature (57-62 degC).

The server is working as intended. There is nothing to fix. This has been reported before and we have investigated it. Our 12th generation servers had a massive overhaul with thermal and acoustic design. Because of this the chassis can get hot to the touch at the rear of the system, but it poses no risk to system components.

You can change the default fan control to increase air flow and reduce the exhaust temperature, but this will increase noise and electricity usage. Go into the iDRAC - iDRAC Settings>Thermal. Change the User Option to Fan Speed Offset and set the Fan Speed Offset to High Fan Speed Offset.

Thanks

Daniel Mysinger
Dell EMC, Enterprise Engineer

Get support on Twitter @DellCaresPRO

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RE: R420 chassis heating due raid controller card

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Hello Rajesh

Where are you getting the temperature reading from? Go into your iDRAC and take a screenshot of the temperatures. Post the picture here. Overview>Server>Power/Thermal>Temperatures(Tab). There is a Temperature Probes section. Take a screenshot of that section.

Thanks

Daniel Mysinger
Dell EMC, Enterprise Engineer

Get support on Twitter @DellCaresPRO

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indiannic
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RE: R420 chassis heating due raid controller card

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hi

the dset report displays normal temperatures since it measures the inlet temperature (26-28 deg C) and the cpu temperature (57-62 degC).

what i refer to is the temperature of the chasis just above the raid controller card and this is not monitored by the drac.

dell india is trying to resolve this for the past 30 days but still there is no resolution and they have set up a test server in their lab and are experiencing exactly the same issue.

to replicate the issue you will need two servers to be placed in a datacenter rack.

create an exactly same setup as below and load windows 2008 r2 OS

R420 - single hexcore processor 2.2 ghz, with 4 X 600 gb 15000 rpm drives
(configured as 2 drives in raid 1 (c: drive with OS ) + 2 drives in raid 1 (d: drive) )

place 2 such servers like this one above the other in the rack.

to create load situation on the drives  simply copy some data between the drives ie from c: to d: which will last for around 1 hour (simply copy/paste the c:\windows folder to d: drive around 15 times from the c drive to d drive). This has to be done on both the servers.

After around 45 mins check temperature of the chassis of the "bottom server"  just above the raid controller card and you will note that the temperature goes to around 45 deg c and this will increase to over 50 degrees if the multiple servers are placed together and the servers are continously under production.

IMPORTANT : you need to use a contact thermometer to measure the temperature and not a Infra-Red thermometer.

can you please check from your side and revert

i could not post the dset report or screenshots of temperature readings because i could not see any option to select a file and attach to this message

personally i feel it is design level issue because the alignment of the heatsink fins on top the raid-controller card is perpendicular to the air-flow and nor parallel to the airflow -- which pretty illogical. The same heatsink in the R620 server is correctly aligned with the fins being parallel to the air flow.

rajesh

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RE: R420 chassis heating due raid controller card

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the dset report displays normal temperatures since it measures the inlet temperature (26-28 deg C) and the cpu temperature (57-62 degC).

The server is working as intended. There is nothing to fix. This has been reported before and we have investigated it. Our 12th generation servers had a massive overhaul with thermal and acoustic design. Because of this the chassis can get hot to the touch at the rear of the system, but it poses no risk to system components.

You can change the default fan control to increase air flow and reduce the exhaust temperature, but this will increase noise and electricity usage. Go into the iDRAC - iDRAC Settings>Thermal. Change the User Option to Fan Speed Offset and set the Fan Speed Offset to High Fan Speed Offset.

Thanks

Daniel Mysinger
Dell EMC, Enterprise Engineer

Get support on Twitter @DellCaresPRO

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indiannic
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RE: R420 chassis heating due raid controller card

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daniel

it is not the cpu temp that i am worried about.

i measured the temperature one of my servers in the middle of the rack again by placing the probe of the contact thermometer on the chasis of the server over the raid controller card at the back to the left of the smps.

one of the servers in the middle measured 57.4 deg celcius which can actually give your a severe burn.

the datacenter i host in has several R620, 520, 720 servers -- none  ever heats up to such a high temperature. I seriously doubt as to why only the R420 model heats up so much.

raid controller card is the most critical component and it is totally closetted from all sides and there is a hot-air pocket being trapped between the chassis on top and the raid-controller heat sink.

Iincreasing the thermal offset to 50 % inceases the fan rpm to 7500 rpm. Will such an increase cause any harm to the fans in the long run since they normally run at around 2000 rpm ?

how much does the power consumption increase -- where do i view this ?

rajesh

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RE: R420 chassis heating due raid controller card

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Iincreasing the thermal offset to 50 % inceases the fan rpm to 7500 rpm. Will such an increase cause any harm to the fans in the long run since they normally run at around 2000 rpm ?

It will likely reduce the life span of the fans.

how much does the power consumption increase -- where do i view this ?

You can compare the wattage by checking the power consumption under the power/thermal section of the iDRAC web interface. You can check before and after turning the fans up to see what the wattage difference is.

Daniel Mysinger
Dell EMC, Enterprise Engineer

Get support on Twitter @DellCaresPRO

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indiannic
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RE: R420 chassis heating due raid controller card

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daniel


This heating issue is prevalent on all my 6 servers

the temperatures ranges from over 50 - 57 deg C on the body of the chassis, only on top of the raid card.

all other dell server models' chasis is less than 40 deg c

if your 12 G servers have been thermally optimized then definitely the chassis should not become so hot.

is it possible for you inform your engineering team and try to duplicate thisheating issue ?


rajesh

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RE: R420 chassis heating due raid controller card

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is it possible for you inform your engineering team and try to duplicate thisheating issue ?

The information I provided in my previous post has not changed. There is not an issue with the server.  We are aware that the servers can get hot to the touch at the top rear of the server, this is not a defect. If you don't like that the server gets hot then I have explained how you can increase the fan speeds to reduce the temperature.

all other dell server models' chasis is less than 40 deg c

Just because something does not work exactly like something else does not mean there is a problem. The 12th generation servers are designed differently than our previous servers.

Daniel Mysinger
Dell EMC, Enterprise Engineer

Get support on Twitter @DellCaresPRO

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indiannic
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RE: R420 chassis heating due raid controller card

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daniel

57 degrees on top of the chassis can burn your hand. and this is happening in in an 18 deg celicius datacenter

it is very hard to believe that this is planned .... !!!

further i am comparing with your 12 generation servers only ie especially the 620 server where the raid raid card in behind on the cpu on the right -- temperature over the chassis is less than 40 deg celcius.

also increasing fan rpm from the normal rpm of around 1500 - 2000 to 7500 ie close to 5 times more is not a solution especially when there is no additional hardware

also there is no explanation as to why the heat sink fins are aligned perpendicular to the air flow in the R420 server instead of being parallel to the air flow as in case of the R620 which is the way it should be.

can you pass on this message to your engineering team to look into.

i am sure DELL is always on the look out for making things better especially from the thermal side

rajesh

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indiannic
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RE: R420 chassis heating due raid controller card

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NOTE:


to replicate this issue you will need 3 nos r420 servers with configuration mentioned above with windows server loaded in them.

the server in the middle will get heated to around 55- 57 deg c

rajesh

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