On Thu, May 04, 2023 at 09:49:22AM +0800, jeremy ardley via Dng wrote:
>
> On 4/5/23 09:38, Hendrik Boom wrote:
> > I have a hard drive, that's been disconnected to its computer or over a year now for harware connection reasone.
> > It contains a RAID parttion that use to part of a RAID1 device on that machine.
> > Now I want to put it back into its machine, so it can once more fuction as part of the RAID it used to be part of.
> >
> > But I absolutel don't want any of the data on it to be treated as valid, because it is massively out of date.
> >
> > But it still has a perfectly valid RAID signature indicating it is part of the RAID it used to be ann active part ot, I am terrified that, after I put the drive back into its machine, the automatic RAID assembly on boot will pick it instaed of the current, up-to-date one as the valid version, and thus lose over a year's data.
> >
> > **What do I have to do to make sure it is *no longer recognised as part of its RAID*
> >
> > so that I can boot with the up-to-date OS (and not the ancient one) and properly use mdadm to add it safely as a new RAID component?
> >
> > All the instructions I've found online an in man pages don't tell me how to remove it from a RAID without it already having been assembled into the RAID. amd that is precisely what I want t prevent from happening prematurely.
> >
> > -- hendrik
> > _______________________________________________
>
> Disconnect the other drives in the RAID and connect the unwanted drive.
> Then boot the system using a USB or DVD live system to run a tool to
> reformat the single drive.
> This assumes you don't have a hardware RAID controller.
>
> An alternative approach is to use a HDD Caddy and connect using USB.
>
> In all cases a simple dd command will remove traces of the RAID
>
> dd if=/dev/zero of=/dev/<yourdrive> bs=10M

Thank you.

The dd worked for the partition that still had a RAID signature.
I performed it on a machine via a USB interface.
and checke it with
    mdadm --examine /dev/sdb2
which did not require me to assemble the RAID first.

-- hendrik

>
>
> Jeremy
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