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Re: debian-installer RAID question

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On 11/09/2021 17:55, Felix Natter wrote:
> hello fellow Debian users,
>
> I have an SSD for the root filesystem, and two HDDs using RAID1 for
> /storage running Debian10. Now I need a plan B in case the upgrade
> fails.

Just want to check that you've not missed something obvious here. You
don't *need* to involve Debian-Installer in an upgrade. Debian fully
supports in-place upgrades. The process is documented here:
https://www.debian.org/releases/bullseye/amd64/release-notes/ch-upgrading.en.html


>
> So I made an experiment with a VM and rougly the same setup (disk-wise),
> and found out that when reinstalling Debian11, the d-i does recognize
> the RAID1 (/storage) and can reuse it while keeping the data.
>
> My question is: How does d-i know how the individual HDDs were combined
> into a RAID1? For all that "sudo fdisk -l" shows, the disks are
> "Linux raid autodetect". For all I see, it could be a RAIDX, X!=1 or
> two different RAIDs .... Are there RAID headers on the partitions?
>
> The same thing applies when I boot a GNU/Linux rescue system: I think I
> can mount the RAID1 if I know the member partitions and type of RAID
> using mdadm?
>
> Many Thanks and Best Regards,

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Thread

debian-installer RAID question Felix Natter <fnatter@gmx.net> - 2021-09-11 19:00 +0200
  Re: debian-installer RAID question Andy Smith <andy@strugglers.net> - 2021-09-11 19:10 +0200
    Re: debian-installer RAID question Felix Natter <fnatter@gmx.net> - 2021-09-18 12:00 +0200
  Re: debian-installer RAID question Reco <recoverym4n@enotuniq.net> - 2021-09-11 19:20 +0200
    Re: debian-installer RAID question Felix Natter <fnatter@gmx.net> - 2021-09-18 12:10 +0200
  Re: debian-installer RAID question Sven Hartge <sven@svenhartge.de> - 2021-09-11 19:30 +0200
    Re: debian-installer RAID question Felix Natter <fnatter@gmx.net> - 2021-09-18 12:00 +0200
  Re: debian-installer RAID question Andrei POPESCU <andreimpopescu@gmail.com> - 2021-09-12 12:20 +0200
    Re: debian-installer RAID question Felix Natter <fnatter@gmx.net> - 2021-09-18 11:50 +0200
  Re: debian-installer RAID question David Christensen <dpchrist@holgerdanske.com> - 2021-09-12 21:10 +0200
  Re: debian-installer RAID question Darac Marjal <mailinglist@darac.org.uk> - 2021-09-12 23:00 +0200
    Re: debian-installer RAID question Felix Natter <fnatter@gmx.net> - 2021-09-18 11:50 +0200

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