Re: kernel errors and unknown SMART properties

I can't address your main question, but I did notice this:

> 199 UDMA_CRC_Error_Count    -O--CK   200   001   ---    -    819

UDMA_CRC_ErrorCount should be 0. That it is 819 indicates a problem. Often
it's the cable.

> Hi!
> My issue is a bit complex. Please bear with me.
> I wrote a lenghty article on the subject a year ago:
> http://yalis.fr/cms/index.php/post/2013/12/14/“If-it-ain’t-broken,-don’t-fix-it”…-or-should-you
>
> At the time, I decided to just let things be, since I had no clue to a
> solution.
> Today, I decided to try some new tests. I ran smartctl with -d marvell,
> ata, scsi, sat, sat,12, sat,16, with -i, -a, -x, diff'ed the results…
> all the time while running tail -f /var/log/syslog | grep kernel.
>
> First, I could see that probably ALL of my kernel errors stem from Smart
> actions.
>
> But all these tests produced loads of Unknown_Attribute. _Until I ran_:
> diff <(smartctl -d sat,12 -x /dev/sda) <(smartctl -d sat,16 -x /dev/sda)
>
> And there, for the first time in a very long time, I could see:
>>   1 Raw_Read_Error_Rate     POSR-K   200   200   ---    -    0
>>   3 Spin_Up_Time            POS--K   229   176   ---    -    3533
>>   4 Start_Stop_Count        -O--CK   100   100   ---    -    568
>>   5 Reallocated_Sector_Ct   PO--CK   200   200   ---    -    0
>>   7 Seek_Error_Rate         -OSR-K   200   200   ---    -    0
>>   9 Power_On_Hours          -O--CK   088   088   ---    -    9333
>>  10 Spin_Retry_Count        -O--CK   100   100   ---    -    0
>>  11 Calibration_Retry_Count -O--CK   100   253   ---    -    0
>>  12 Power_Cycle_Count       -O--CK   100   100   ---    -    36
>> 192 Power-Off_Retract_Count -O--CK   200   200   ---    -    24
>> 193 Load_Cycle_Count        -O--CK   200   200   ---    -    543
>> 194 Temperature_Celsius     -O---K   118   110   ---    -    32
>> 196 Reallocated_Event_Count -O--CK   200   200   ---    -    0
>> 197 Current_Pending_Sector  -O--CK   200   200   ---    -    0
>> 198 Offline_Uncorrectable   ----CK   200   200   ---    -    0
>> 199 UDMA_CRC_Error_Count    -O--CK   200   001   ---    -    819
>
> So I thought: Oh!, so sat,16 is the right value, and I forgot to specify
> ",16" before! Well, except that this is the default value, and sure
> enough, a subsequent run of smartctl -d sat,16 -x /dev/sda just gave me
> Unknown_Attribute. Bummer.
>
> I tried to run this last command again and again, to no avail: only
> Unknown_Attribute :-(
>
> _But_ I found that running with -d sat,12, then -d sat,16, then -d
> sat,12, and so on, would sometimes give me the right output. Only, this
> right output would sometimes occur while running with -d sat,16, and
> sometimes occur while running with -d sat,12! So weird.
>
> Oh, and did I mention, that while it is so hard to get a useful result
> with smartctl, smartd seems to run mostly happily, since I am notified
> every day of a bunch of changes in the temperature property from 118 to
> 117, and back to 118, and so on… and a couple of other properties too.
> I'm lost, I don't get the logic of any of this.
>
> I don't want to make this mail any longer than it already is, so I'll
> stop here. But please advise me in kernel configuration, smart
> configuration, anything. Ask questions! About anything! This can be a
> long-winded year-long exploration if need be.
> Thanks,
>
> Yves.
>
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