Re: read and write back full disk to trigger relocation

In reply to: Artem Kuchin : "read and write back full disk to trigger relocation"
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From: David Christensen <dpchrist_at_holgerdanske.com>
Date: Sun, 28 May 2023 16:06:50 UTC

On 5/28/23 04:12, Artem Kuchin wrote:
> Hello!
> 
> I have a 3TB gmirror raid and i noticed that it can be a case that some 
> data decays and i would never know it.
> 
> If course i can run full disk read once in a while, but i'd rather 
> prefer to read  and write the data back, so it sector
> 
> is damaged it can trigger relocation.
> 
> Is there a ready made utility for such task or i need to write my one?
> 
> Artem

If you are worried about disk drives, I would look for a manufacturer 
diagnostic tool.  Such tools can do things via an OS, but they can also 
tell the drive controller to do things directly.  For example, Seagate:

https://www.seagate.com/support/downloads/seatools/

You might want to consider switching to ZFS; it includes data and 
metadata integrity checks that can detect "bit rot" (and fix it, if you 
have redundancy; such as mirrors).

David