[email protected] (Riccardo Mottola) writes:
>> Also use atactl to check the smart status of the disk.
>How reliable is that data?
It's what the manufacturer tells you.
> 1 58 34 yes online positive Raw read error rate 27218486
>195 58 0 no online positive Hardware ECC Recovered 27218486
> 1 59 34 yes online positive Raw read error rate 232650323
>195 59 0 no online positive Hardware ECC Recovered 232650323
> 1 60 34 yes online positive Raw read error rate 73875073
>195 60 0 no online positive Hardware ECC Recovered 73875073
>The number of read errors skyrocketed!
There is no number of read errors given. The raw values only have
a vendor specific meaning, can be anything. Some vendors document
the raw values.
You have a value of 58, then 59, then 60 and a threshold of 34.
When the value reaches the treshold (from above!) or sinks below,
the drive will flag an error.
smartmontools can show some more details, e.g.:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED
WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 113 099 006 Pre-fail Always
- 58007672
195 Hardware_ECC_Recovered 0x001a 027 027 000 Old_age Always
- 58007672
This also shows some undecipherable raw value, but also a "worst
case" datum for the drive.
So, the raw read error rate isn't a count, but some kind of average
for how frequent read errors occurred. And apparently the numbers
of read errors and ECC recovery events seem to be correlated.
Modern drives produce a huge amount of correctable ECC errors and
some report such confusing SMART data.
--
--
Michael van Elst
Internet: [email protected]
"A potential Snark may lurk in every tree."
