On Wed, Oct 17, 2018 at 11:57:34PM +0000, Hinz, David (GE Healthcare) wrote:
> I'd like to submit an opposing viewpoint.
> If SMART disk analysis says it's going to break, replace it.
> Nothing is worth risking lost data.


I second this.

My only case of false positive (SMART reports complete failure while
disk still seems to work) has been a worn out 2 TB "green" WD disk.
By "worn out" I mean that it was (a) heavily used and (b) all it's mates
of same vintage, age and heavy use have already failed (with i/o errors, etc).


K.O.




> 
> 
> On 10/17/18, 4:50 PM, "[log in to unmask] on behalf of Konstantin Olchanski" <[log in to unmask] on behalf of [log in to unmask]> wrote:
> 
>     > 
>     > # smartctl -a /dev/sda
>     > ...
>     > Device Model:     TOSHIBA MG03ACA100
>     > ...
>     
>     Thank you for posting your data, here is my reading of smartctl data:
>     
>     > 
>     > === START OF READ SMART DATA SECTION ===
>     > SMART overall-health self-assessment test result: PASSED
>     >
>     
>     this you can ignore, I have held in my hands disks that reported "PASSED"
>     but were dead, could not read, could not write anything. Also had
>     disks that worked perfectly but reported "FAILED" here.
>     
>     
>     Next goes the meat of the data:
>     
>     > ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE UPDATED  WHEN_FAILED RAW_VALUE
>     >   4 Start_Stop_Count        0x0032   100   100   000    Old_age Always       -       26
>     
>     Your disk is brand new, only ever saw 26 power cycles.
>     
>     >   9 Power_On_Hours          0x0032   051   051   000    Old_age Always       -       19725
>     
>     Your disk is brand new, 19725 hours is 2.2 years.
>     
>     > 194 Temperature_Celsius     0x0022   100   100   000    Old_age Always       -       32 (Min/Max 20/37)
>     
>     You have good cooling, temperature is 32C, as high as 40C is usually okey, above 50C means the cooling fans are dead.
>     
>     >   5 Reallocated_Sector_Ct   0x0033   100   100   050    Pre-fail Always       -       0
>     > 196 Reallocated_Event_Count 0x0032   100   100   000    Old_age  Always       -       0
>     > 198 Offline_Uncorrectable   0x0030   100   100   000    Old_age  Offline      -       0
>     > 199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age  Always       -       0
>     
>     Your disk does not report any problems reading or writing data to the magnetic media.
>     
>     Conclusion: healthy as a bull.
>     
>     -- 
>     Konstantin Olchanski
>     Data Acquisition Systems: The Bytes Must Flow!
>     Email: olchansk-at-triumf-dot-ca
>     Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada
>     
> 

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada