Re: read and write back full disk to trigger relocation

Reply: David Christensen : "Re: read and write back full disk to trigger relocation"
Reply: Lena_a_lena.kiev.ua: "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: Sysadmin Lists <sysadmin.lists_at_mailfence.com>
Date: Sun, 28 May 2023 21:45:40 UTC

> ----------------------------------------
> From: Artem Kuchin <artem@artem.ru>
> Date: May 28, 2023, 4:12:21 AM
> To: <freebsd-questions@FreeBSD.org>
> Subject: read and write back full disk to trigger relocation
> 
> 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.
> 
> 

From the dd(1) manpage:

     Do a refresh of a disk drive, in order to prevent presently recoverable
     read errors from progressing into unrecoverable read errors:

           dd if=/dev/ada0 of=/dev/ada0 bs=1m

That won't trigger relocation, but it will refresh the decaying data.

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