[6.4.0-rc8q] Average disk temperature readings

[realies]

What is the point in having average value for all disk temperature readings? It provides no useful or practical information.

 

 

Edited September 8, 2017 by realies

[gubbgnutten]

4 hours ago, realies said:

What is the point in having LCM for all disk temperature readings?

Can't think of any reason right now why that would be useful, there are simply too many primes in the typical temperature span for LCM to be of any interest imho. 

[realies]

What I mean is that one would be interested in the temperature values for individual disks and never the average between all of them.

[bonienl]

I keep track of the average temperature to get an overview over a period of time. Gives me an indication when there hot or cold days.

[gubbgnutten]

1 hour ago, realies said:

What I mean is that one would be interested in the temperature values for individual disks and never the average between all of them.

Well, "never" is a pretty broad claim when speaking for everyone. From what I can tell the average is not occupying space that could be used by something else, so I don't really see how having it would be a problem. I actually find it rather convenient to have.

 

Still no idea what LCM got to do with the average temperature. 

 

 

[realies]

Lost in translation there, I have edited the post.

 

@bonienl, what if one of the disks has an issue that brings its temperature up because of internal mechanical malfunction? This would affect the reading of the average temperature from which you take "hot or cold days".

 

@gubbgnutten, I understand the "if it's not doing any harm, let it be" attitude, but this is the statistics page. Is there any other practical usage of the average, other than assumptions such as "It is a hot day today because my average between all disks is x °C".

 

This indication could be greatly influenced and made even more irrelevant in a case of a system with dynamic fan speeds based off temperature sensor readings.

Edited September 8, 2017 by realies

[gubbgnutten]

High average temperature: There is likely a problem. Investigate!

 

Individual disk/disks notably hotter than the average (especially during parity checks): Worth looking into specific cage/part of the server.

[BobPhoenix]

Plus a single drive in a group of 20 drives isn't going to skew the average much if you only have one drive with a problem.  But if you see it going up you know that you may have a fan problem because it would take more than just a single drive to change the temp by x amount.