Subject: Re: bug#38086: RAID installation script with ‘mdadm’ no longer works

From: Gábor Boskovits <[email-masked]>
Date: Wed, 6 Nov 2019 12:07:39 +0100

Hello Ludo,

Ludovic Courtès <[email-masked]> ezt írta (időpont: 2019. nov. 6., Sze,
11:14):

> Hello,
>
> Looks like our RAID installation method no longer works, as can be seen
> at <https://ci.guix.gnu.org/build/1906208/details>:
>
> --8<---------------cut here---------------start------------->8---
> + guix --version
> guix (GNU Guix) c4de60ac3c6aa5b46519011af89988215c347e9e
> Copyright (C) 2019 the Guix authors
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> + export GUIX_BUILD_OPTIONS=--no-grafts
> + GUIX_BUILD_OPTIONS=--no-grafts
> + parted --script /dev/vdb mklabel gpt mkpart primary ext2 1M 3M mkpart
> primary ext2 3M 600M mkpart primary ext2 600M 1200M set 1 boot on set 1
> bios_grub on
> + mdadm --create /dev/md0 --verbose --level=stripe --raid-devices=2
> /dev/vdb2 /dev/vdb3
> mdadm: chunk size defaults to 512K
> mdadm: Defaulting to version 1.2 metadata
> [   13.890586] md/raid0:md0: cannot assemble multi-zone RAID0 with
> default_layout setting
> [   13.894691] md/raid0: please set raid0.default_layout to 1 or 2
> [   13.896000] md: pers->run() failed ...
> mdadm: RUN_ARRAY failed: Unknown error 524
> [   13.901603] md: md0 stopped.
> --8<---------------cut here---------------end--------------->8---
>
> Anyone knows what it takes to “set raid0.default_layout to 1 or 2”?
>

On kernel 5.3.4 and above the
raid0.default_layout=2 kernel boot paramter should be set. We should
generate our grub configuration accordingly.

See this for reference:
https://blog.icod.de/2019/10/10/caution-kernel-5-3-4-and-raid0-default_layout/

> We should then update (gnu tests install) and the manual accordingly.
>
> Thanks,
> Ludo’.
>
Best regards,
g_bor

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