ZFS...

[Michelle Sullivan]

Paul Mather wrote:
> On May 8, 2019, at 9:59 AM, Michelle Sullivan <michelle at sorbs.net> wrote:
>
>> Paul Mather wrote:
>>>> due to lack of space.  Interestingly have had another drive die in 
>>>> the array - and it doesn't just have one or two sectors down it has 
>>>> a *lot* - which was not noticed by the original machine - I moved 
>>>> the drive to a byte copier which is where it's reporting 100's of 
>>>> sectors damaged... could this be compounded by zfs/mfi driver/hba 
>>>> not picking up errors like it should?
>>>
>>>
>>> Did you have regular pool scrubs enabled?  It would have picked up 
>>> silent data corruption like this.  It does for me.
>> Yes, every month (once a month because, (1) the data doesn't change 
>> much (new data is added, old it not touched), and (2) because to 
>> complete it took 2 weeks.)
>
>
> Do you also run sysutils/smartmontools to monitor S.M.A.R.T. 
> attributes?  Although imperfect, it can sometimes signal trouble 
> brewing with a drive (e.g., increasing Reallocated_Sector_Ct and 
> Current_Pending_Sector counts) that can lead to proactive remediation 
> before catastrophe strikes.
not Automatically
>
> Unless you have been gathering periodic drive metrics, you have no way 
> of knowing whether these hundreds of bad sectors have happened 
> suddenly or slowly over a period of time.
no, it something i have thought about but been unable to spend the time on.

-- 
Michelle Sullivan
http://www.mhix.org/