debian-installer RAID question

From	Felix Natter <fnatter@gmx.net>
Newsgroups	linux.debian.user
Subject	debian-installer RAID question
Date	2021-09-11 19:00 +0200
Message-ID	<CWewb-54H-11@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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.

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,
-- 
Felix Natter
debian/rules!

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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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