Re: using ddrescue on the root partition - boot with / as read-only

[David Christensen <dpchrist@holgerdanske.com>]

On 9/13/23 04:54, Vincent Lefevre wrote:
> Hi,
>
> I need to use ddrescue on the root partition of my laptop.
>
> So I need to have the root partition mounted in read-only mode.
> How can I do that?
>
> Note that "mount -o remount,ro /" gives an error "mount point is busy"
> apparently because various log files are open in write mode.
>
> Using the recovery mode via GRUB (which mounts / in read-only mode)
> is useless because the system remounts it later as rw.
>
> Or is there a way to force a remount in read-only mode?
> (I could probably trigger a disk error to make the kernel remount /
> as read-only, but well...)


What symptom(s) is your laptop exhibiting that make you think that you 
need to use ddrescue(1) on the root partition?

https://en.wikipedia.org/wiki/XY_problem


Have you read the "GNU ddrescue Manual"?

https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html


David