From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tobias Geerinckx-Rice <me@tobias.gr>
Subject: Re: Root partition on raid?
Date: Thu, 13 Jun 2019 00:53:08 +0200
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To: Tonton <tonton@riseup.net>
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Tonton,

Tonton wrote:
> Hi, no, I use mdadm. Can GRUB see/use/boot this?

Yes!  Then I think Guix has everything you need.

> Maybe this is way easier than I thought. Could you share how you=20
> configure
> this on your end?=20

Nothing fancy:

=2D-8<---------------cut here---------------start------------->8---
 (mapped-devices
  (list
   (mapped-device
    (type raid-device-mapping)
    (source (list "/dev/sda2" "/dev/sdb2" "/dev/sdc2"=20
    "/dev/sde2"))
    (target "/dev/md0"))))
 (file-systems
  (cons*
   (file-system
    (dependencies mapped-devices) ; XXX is this needed?
    (device "/dev/md0")
    (mount-point "/")
    (type "btrfs")
    (options "compress=3Dzlib,relatime"))
   (file-system
    (device (file-system-label "EFI"))
    (mount-point "/boot/efi") (create-mount-point? #t)
    (type "vfat"))
   %base-file-systems))

=E2=80=A6

 (bootloader
  (bootloader-configuration
   (bootloader grub-efi-bootloader)
   (target "/boot/efi")
   (timeout (seconds 1))))
=2D-8<---------------cut here---------------end--------------->8---

(That comment's been there for years; in true admin fashion I=20
haven't touched a working set-up.)

Guix doesn't use mdadm.conf or whatever it's called.  Depending on=20
your system, using labels or UUIDs instead of device names could=20
make it more robust, or merely complicate drive replacement in=20
future.

Adding LUKS to this mix should be possible too, but I haven't=20
tried it myself.

Kind regards,

T G-R

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