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Forum Discussion
ReadyNAS RN104 shutdown because disks exceed safe temperature after defrag - follow up thread
Hello StephenB , hello all, I'm "reopening" my old thread from April 2020 because I have new details which may help to track down the issue. StephenB sorry for tagging you directly but you were invo...
I'm thinking that you did clean any dust back when you replaced the fan - is that correct?
It's a clean looking installation, with plenty of space around the NAS.
HolgerGT86 wrote:
For me it looks like the RN104 is not getting the temperature values of the disk drives while defrag is running. Because of this, the RN104 firmware is not increasing the fan speed when the disk drives' temperature raises.
Possible - I don't know how often it reads the temps (and it might be a lower priority process than the defrag).
HolgerGT86 wrote:
I did some research in the forum already and found that disks may not return their temperature value when they sleep. I enabled disk sleep when idle for 10 minutes.
So it's possible the disks where sleeping and waking up when defrag started.
Also possibly part of the puzzle. You could try disabling spindown for little while, and wait for the next defrag.
Some users have reported that keeping the NAS door open lowered their disk temps - so maybe try that also.
Though I am wondering if it's simply one of the disks starting to fail (and overheating). Though I have no idea why this only happens when defragging.
Hello StephenB,
thanks for your prompt reply.
Yes, I cleaned everything inside the RN104 and the disk drives + trays, etc.
The RN104 has it's door open all the time, nothing is blocking the Air flow front and rear side. It's placed in a rack just for the RN104.
It's located in the cellar, room temperature about 15°C all the year. Although please keep in mind that the replacement fan I'm using has a very high air pressure, much more then the original fan. Nevertheless, the high air pressure does not help if the RN104 firmware is not detecting the disk temperature is raising up and therefore not increasing the fan speed.
None of the disks is failing. I already rotated the disks and always the middle 2 disk drives reach the 60°C.
It seems to be not depending on the disk load, because it ONLY happens when defrag is running/ ended. It never happened for data scrubbing nor any other workload like host backups, data movements, whatever, only defrag.
I don't know who's maintaining the firmware or who's writing firmware fixes, but will it be possible to find out why the firmware is not able to refresh the disk temperature when defrag is running? Maybe defrag is locking out other processes, maybe because of the slow Marvel processor used here?
Although I'ld like to get this resolved in the RN104 firmware, my mitigation is clear: I'll keep the RN104 running, even if the disk temperature raises up to 60°C, because I know that after defrag it will cool down very quickly.
Anyway ... not a nice behaviour.
It's late in Germany already, I'll drop off now.
Regards,
Holger
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