Seagate IronWolf 8TB temp in SM 826

[fossxplorer]

Hi,
i'm running burn-in tests of my newly acquired disks and i notice rather the huge difference in the temps:
[root@localhost]# for i in b d e f g;do smartctl -a /dev/sd$i| grep 'Temperature_Celsius';done
194 Temperature_Celsius 0x0022 028 040 000 Old_age Always - 28 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 037 042 000 Old_age Always - 37 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 030 040 000 Old_age Always - 30 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 038 042 000 Old_age Always - 38 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 032 040 000 Old_age Always - 32 (0 22 0 0 0)
[root@localhost]# ipmitool sensor | grep System
System Temp | 29.000 | degrees C | ok | -9.000 | -7.000 | -5.000 | 75.000 | 77.000 | 79.000

System temp seems to be ~29C, while disks' temp range from 28-38. I'm using the SM 826 top 4 bays + the rightmost in the next row (middle row).

Is this pure airflow issue?

 

[pgh5278]

Hi,
i'm running burn-in tests of my newly acquired disks and i notice rather the huge difference in the temps:
[root@localhost]# for i in b d e f g;do smartctl -a /dev/sd$i| grep 'Temperature_Celsius';done
194 Temperature_Celsius 0x0022 028 040 000 Old_age Always - 28 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 037 042 000 Old_age Always - 37 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 030 040 000 Old_age Always - 30 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 038 042 000 Old_age Always - 38 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 032 040 000 Old_age Always - 32 (0 22 0 0 0)
[root@localhost]# ipmitool sensor | grep System
System Temp | 29.000 | degrees C | ok | -9.000 | -7.000 | -5.000 | 75.000 | 77.000 | 79.000

System temp seems to be ~29C, while disks' temp range from 28-38. I'm using the SM 826 top 4 bays + the rightmost in the next row (middle row).

Is this pure airflow issue?

How is the rear flow access for each drive, not impedded by cable / or built in LSI expander if a EL1 or EL2 backplane.. I have noticed on even a set of 8 x 2.5" (15mm thick drivcs, the outer ones are a little cooler than inner ones..?) Good Luck..What is ambient temp, assuming case is closed..? do these drives differ in temp if all run external to the chassis?

 

[Rain]

Are all of the other bays empty, or are they populated too? If the other bays are unpopulated, airflow over the disks is probably not the best as it's all being sucked through the empty bays (path of lease resistance).

 

[Diavuno]

The above is correct. Make sure you have the tan fillers for each sled

Sent from my 0PJA2 using Tapatalk

 

[fossxplorer]

@pgh5278 It's direct attach backplane (826 TQ) so a lot's of SATA cable in the rear: Some not too clear images at OwnDrive. It's not ideal with space in between backplane and the fans as you can see.
Amb temp i have no equip for measuring. Just ordered one now Case is closed and i've not tested disks outside the chassis.
@Rain @Diavuno Yes, i didn't have all the bays populated, just 1 more so 6 was. Now it's all populated since last night, but not much of a change. Need to keep in mind that one disk that showed lowest temp of 28C had very slow progress so i was able to kick it with running hdparm and restart the badblock on it. Now it's temp has risen, naturally:
root@localhost ssd300]# for i in b d e f g;do smartctl -a /dev/sd$i| grep 'Temperature_Celsius';done
194 Temperature_Celsius 0x0022 034 040 000 Old_age Always - 34 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 039 042 000 Old_age Always - 39 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 032 040 000 Old_age Always - 32 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 038 043 000 Old_age Always - 38 (0 22 0 0 0)
194 Temperature_Celsius 0x0022 032 040 000 Old_age Always - 32 (0 22 0 0 0)

But it's in my apartment, up in a closet in my kitchen actually to avoid noise to rest of the area inside


This is my first usage/test of the disks before shipping those with the server to a DC in the Netherlands.

 

[Tom5051]

I noticed the same thing on my 11 disk array just the other day. I suspect that there is a slight variation in the calibration of the temp sensors in each drive, let's face it, they won't have the most super accurate sensors money can buy on them.
I checked each drive with a non contact laser thermometer and they were all within 1 degree of each other.
I suspect you are seeing the same if your airflow is reasonably even.

 

[fossxplorer]

That's a possible explanation of the rather huge differences. I've ordered GM320 (takes ~month to arrive i assume from China), but won't be able to test it before the disks are shipped to the DC. I will try to check the temp close to the disks using standard home thermometer i should have laying around that has a probe just get an idea

 

[Tom5051]

That's a possible explanation of the rather huge differences. I've ordered GM320 (takes ~month to arrive i assume from China), but won't be able to test it before the disks are shipped to the DC. I will try to check the temp close to the disks using standard home thermometer i should have laying around that has a probe just get an idea

Nice, it will be interesting to see how the GM320 readings compare to the on-board sensor.
I'm pretty sure the disk sensor is internal but I figured the disks body would show the same variations regardless though conducted heat. I suppose you could call it an average temp?