Re: Getting rid of pending sectors

Badblocks non-destructive write test is EXTREMELY slow. So much so I
recommend backing everything up, doing the destructive write test, and
restoring (depending on how the test went) as it is usually faster.

Beyond that, a read test, either badblocks or SMART should tell you were
at least the first pending sector is. I generally use the short SMART
test. It stops on the first pending sector it finds, but it is quick.
"Fix" that sector and re-run until it completes. If there are still
pending sectors, then you have do to the full test.

> Hello Bob,
>
>  
> Thanks for your answer.
>
> Tried ‘badblocks -b 4096 -c 8 -svn -o /home/badblocks.n.sdb /dev/sdb’
> but it takes 6 hours to achieve 1% so I stopped dit.
>
> Any way to know where those pending sectors are so I can tell badblocks
> where to search ?
>
>  
> Regards,
>
> Ozy.
>
>  
> De : Bob Weber [mailto:[email protected]]
> Envoyé : dimanche 23 octobre 2016 19:57
> À : [email protected]
> Objet : Re: [smartmontools-support] Getting rid of pending sectors
>
>  
> Try badblocks with the non destructive write mode test (-n see "man
> badblocks").  That way the drive should remap the sectors after the write
> process and hopefully your data will be intact afterwords.
>
>
> ...Bob
>
> On 10/22/2016 02:03 PM, Orsiris de Jong wrote:
>
> Hello,
>
>  
> I own a small private NAS with 2x WD RE4 4TB drives.
>
> One of the drives recently got a number of current pending sectors :
>
>  
> 197 Current_Pending_Sector  0x0032   200   200   000   
> Old_age   Always       -       142
>
> 198 Offline_Uncorrectable   0x0030   200   200   000   
> Old_age   Offline      -       142
>
>  
> The smart long self test suceeds.
>
> I’ve tried to force the firmware to reallocate the sectors by reading
> them.
>
> So far I’ve tried :
>
> dd if=/dev/sdb of=/dev/null bs=4096
>
> badblocks -b 4096 -c 8 -sv -o /root/badblocks.sdb /dev/sdb
>
>  
> Neither of both commands changed anything, and the badblocks utility
> reports 0 bad blocks.
>
> Usually the self test locates at least the bad sectors so I can write to
> the sector and force reallocation, but nothing here.
>
>  
> I’m used to not trust a drive if it gets more than 10 bad sectors, but
> as it’s a private server, I’m pretty unwilling to spend 300$ into new
> 4TB RE4 / Gold drives.
>
>  
> Any suggestions ?
>
>  
> Regards,
>
> Ozy.
>
>
>
>
>
>
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