[smartmontools-support] Time in Over-Temperature seems to be incorrect

[Christian Franke]

Claudio Kuenzler wrote:
>
>     0x05  =====  =      =  ===  == Temperature Statistics (rev 1) ==
>     0x05  0x008  1              30  ---  Current Temperature
>     0x05  0x010  1              32  ---  Average Short Term Temperature
>     0x05  0x018  1              32  ---  Average Long Term Temperature
>     0x05  0x020  1              61  ---  Highest Temperature
>     0x05  0x028  1               0  ---  Lowest Temperature
>     0x05  0x030  1              41  ---  Highest Average Short Term
>     Temperature
>     0x05  0x038  1               0  ---  Lowest Average Short Term
>     Temperature
>     0x05  0x040  1              43  ---  Highest Average Long Term
>     Temperature
>     0x05  0x048  1               0  ---  Lowest Average Long Term
>     Temperature
>     0x05  0x050  4              41  ---  Time in Over-Temperature
>     0x05  0x058  1              70  ---  Specified Maximum Operating
>     Temperature
>     0x05  0x060  4               0  ---  Time in Under-Temperature
>     0x05  0x068  1               0  ---  Specified Minimum Operating
>     Temperature
>
>
> OK, I see where you see the 41. I happen to have the same model 
> (Crucial MX 500 1TB) laying around here, so I quickly plugged it in to 
> see if I see something similar. And indeed:
>
> 0x05  =====  =               =  ===  == Temperature Statistics (rev 1) ==
> 0x05  0x008  1              31  ---  Current Temperature
> 0x05  0x010  1              50  ---  Average Short Term Temperature
> 0x05  0x018  1              50  ---  Average Long Term Temperature
> 0x05  0x020  1              60  ---  Highest Temperature
> 0x05  0x028  1               0  ---  Lowest Temperature
> 0x05  0x030  1              51  ---  Highest Average Short Term 
> Temperature
> 0x05  0x038  1               0  ---  Lowest Average Short Term Temperature
> 0x05  0x040  1              51  ---  Highest Average Long Term Temperature
> 0x05  0x048  1               0  ---  Lowest Average Long Term Temperature
> 0x05  0x050  4              50  ---  Time in Over-Temperature
> 0x05  0x058  1              70  ---  Specified Maximum Operating 
> Temperature
> 0x05  0x060  4               0  ---  Time in Under-Temperature
> 0x05  0x068  1               0  ---  Specified Minimum Operating 
> Temperature
>
> As in your case, the highest temperature was never above the 
> "specified maximum operating temperature". Yet 0x05:0x050 (Time in 
> Over-Temperature) shows a value of 50 (41 in your case).
> I suspect this to be a false information from the drive or a false 
> interpretation of the drive's data by smartctl. @Christian maybe you 
> can spot this immediately?

Unfortunately debug hex dump for device statistics is still missing in 
the ATA layer, but under linux SCSI/SAT hex dump should be present.

To check whether smartctl prints the value correctly, please provide the 
output of the following command as an attachment:
   smartctl -r ioctl,2 -l devstat,5 /dev/...
Only the output after "Device Statistics (GP Log 0x04)" is relevant. You 
could discard the dump of the ATA IDENTIFY data block which contains the 
serial number.

Thanks,
Christian