[smartmontools-support] selt-tests hours record inferior to current power in hours
Carlos E. R.
robin.listas at telefonica.net
Wed May 4 11:52:57 CEST 2022
On 2022-05-02 13:43, Corentin Labbe wrote:
> Hello
>
> When doing a self test, I have multiple drive which record it with a lifetime different than current power on hours:
> Example 1:
> 9 Power_On_Hours 0x0032 089 089 000 Old_age Always - 52717
> Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
> # 1 Short offline Completed without error 00% 9937 -
> # 2 Short offline Completed without error 00% 9821 -
> # 3 Extended offline Completed without error 00% 9818 -
> # 4 Extended offline Completed without error 00% 9776 -
> # 5 Extended offline Completed without error 00% 7284 -
> # 6 Extended offline Completed without error 00% 7284 -
> # 7 Short offline Completed without error 00% 17463 -
> # 8 Extended offline Completed without error 00% 16958 -
> # 9 Extended offline Completed without error 00% 15021 -
> #10 Extended offline Completed without error 00% 14404 -
> #11 Extended offline Completed without error 00% 14386 -
>
> This driver just got a self test today
> As can be seen, the last is at 9937 hours but current Power_On_Hours is 52717.
The first is 9937, not the last :-)
>
> Example 2:
> I got another driver with the same problem:
> 9 Power_On_Hours 0x0032 007 007 000 Old_age Always - 68178
> Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
> # 1 Short offline Completed without error 00% 2642 -
> # 2 Short offline Completed without error 00% 2642 -
> # 3 Extended offline Interrupted (host reset) 90% 1346 -
> # 4 Extended offline Interrupted (host reset) 80% 1298 -
> # 5 Extended offline Interrupted (host reset) 10% 483 -
> # 6 Extended offline Completed without error 00% 467 -
> # 7 Extended offline Interrupted (host reset) 50% 61490 -
> # 8 Extended offline Completed without error 00% 60302 -
> # 9 Short offline Completed without error 00% 60299 -
> #10 Extended offline Completed without error 00% 60028 -
> #11 Extended offline Completed without error 00% 58615 -
> #12 Short offline Completed without error 00% 58568 -
> #13 Extended offline Completed without error 00% 52790 -
> #14 Extended offline Completed without error 00% 50530 -
> #15 Extended offline Completed: read failure 90% 50290 105986680
> #16 Extended offline Completed without error 00% 50057 -
> #17 Short offline Completed without error 00% 50054 -
>
> In example 2, the difference is exactly 65536, but example 1 is 42780.
>
> Does this is normal ?
Yep. Unsigned integer wrap (16 bit).
--
Cheers / Saludos,
Carlos E. R.
(from 15.3 x86_64 at Telcontar)
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