[smartmontools-support] growing Reallocated_Sector_Ct

[Eyal Lebedinsky]

On 23/6/24 21:58, Eyal Lebedinsky wrote:
> I log the output of 'smartctl -d sat -x /dev/sda' daily. I recently noticed that I see an
> increasing Reallocated_Sector_Ct, so I installed a replacement disk, copied the data across
> and adjusted the mount points. The old disk is still installed but idle and not mounted.
> 
> My issue is I see that Reallocated_Sector_Ct is still growing. iostat shows no write activity.
> The smartd config schedules a short selftest daily.
> 
> Is the selftest the cause of the increasing count?
> I understand that reallocation is something the disk does on a failed write. Are there other reasons?
> 
> If it matters, the disk is an old (2012?) internal 3.5" 3TB:
>      Model Family:     Seagate Barracuda 7200.14 (AF)
>      Device Model:     ST3000DM001-9YN166
> 
> Regards
> 

I know that this model is not great (to say the least). And this one is very old. Problems were expected.

However my question is more specific. Not doing any writes,
	Is the selftest the cause of the increasing Reallocated_Sector_Ct?

Regards

-- 
Eyal at Home (eyal at eyal.emu.id.au)