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Forum Discussion
readynas 6.5.0 new fan speeds buggy
Upgraded a R516 yesterday from 6.4 to 6.5.0. Before the upgrade, the fan noise was generally minimal with fan speeds between 1K-1.5K rpm and drives kept at a uniform temperature of 48-53 degrees ...
OK, so on the first try, I aborted the balance fan mode test due to complaints from those in the same room as the NAS that it was making it impossible to work when FAN was at 3600RPM.
This time, I provided warning that the loud noise would go away after 5 minutes....and it did, but things still aren't right.
Before 6.5 firmware, Drives averaged around 50-52 degrees and never went over 54. Fan noise was never problem.
Quiet mode is now having them average 52-54 and the highest temperature we see is spikes at 56 degrees. This is a tad too high for our liking. Average Fan RPM seemed to be between 800-1400rpm, with 1200 the most frequent. Quiet mode is however indeed quiet.
On to the new balanced, the fan has stabilized at 1802rpm - a huge bump up and really more than what was needed. Drives are now averaging ~45 degrees. We only wanted to reduce drive temps back to pre 6.5 status...2-4 degrees, not the 6-9 degrees and +600rpm. The increased fan speed is not horribly loud, but it is much louder than we'd like and I'm not sure how much power it is using. I'm guessing if we could manually set to ~1400-1500, about half way between quiet and balanced - we'd get closer to pre 6.5 behavior.
hard drive temp around 55 degrees is very high so durability will be in question
best to keep the temp below 48 degrees
In general temperatures for disks under 60 degrees are fine. In quiet mode the fans will still spin up if they need to.
mdgm wrote:
In general temperatures for disks under 60 degrees are fine.
Well, that depends on what you mean by "fine". The temps are within the manufacturer specs (which might be "fine" for many people), But I don't think they are optimal.
One study has found that drive failure rate starts to climb as drive temps go above 34 degrees C (http://www.cs.virginia.edu/~gurumurthi/papers/acmtos13.pdf figure 5) Table 2 in the same study shows that drives running at 55C have an AFR (annualized failure rate) that is twice that of drives running at 40C.
Google's classic drive study found a weaker correlation between drive temp and failure rate. Though they weren't focused exclusively on temperature, they did find higher failure rates with drive temps above 45 C.
BackBlaze sees no general correlation - although they did find a correlation for some drive models. But their drives are all run between 20-30 degrees C.
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