GNU bug report logs - #38086
RAID installation script with ‘mdadm’ no longer works

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#38086: closed (RAID installation script with ‘mdadm’
 no longer works)
Date: Sun, 19 Jan 2020 22:14:02 +0000

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Your message dated Sun, 19 Jan 2020 23:13:32 +0100
with message-id <87a76jqelv.fsf <at> gnu.org>
and subject line Re: bug#38086: RAID installation script with ‘mdadm’ no longer works
has caused the debbugs.gnu.org bug report #38086,
regarding RAID installation script with ‘mdadm’ no longer works
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Ludovic Courtès <ludo <at> gnu.org>
To: bug-Guix <at> gnu.org
Subject: RAID installation script with ‘mdadm’ no
 longer works
Date: Wed, 06 Nov 2019 11:13:13 +0100

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”?

We should then update (gnu tests install) and the manual accordingly.

Thanks,
Ludo’.

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Tobias Geerinckx-Rice <me <at> tobias.gr>
Cc: Vagrant Cascadian <vagrant <at> debian.org>, 38086-done <at> debbugs.gnu.org
Subject: Re: bug#38086: RAID installation script with ‘mdadm’ no longer works
Date: Sun, 19 Jan 2020 23:13:32 +0100

Hi Tobias!

Tobias Geerinckx-Rice <me <at> tobias.gr> skribis:

> It's just waiting for input:
>
>  $ # dd & losetup magic, where loop0 is 20% larger than loop1
>  $ sudo mdadm --create /dev/md0 --verbose --level=mirror
> --raid-devices=2 /dev/loop{0,1}
>  mdadm: Note: this array has metadata at the start and
>    may not be suitable as a boot device.  If you plan to
>    store '/boot' on this device please ensure that
>    your boot-loader understands md/v1.x metadata, or use
>    --metadata=0.90
>  mdadm: size set to 101376K
>  mdadm: largest drive (/dev/loop1) exceeds size (101376K) by more than
> 1%
>  Continue creating array?

D’oh, I hadn’t seen that message.

> Adding --force does not avoid this.
>
> I recommend tweaking the partition table to make both members equal,
> but a ‘yes|’ also works if you're in a hurry ;-)

“yes|” works like a charm, I went this that.

Pushed in commit 3adf320e44e54017a67f219ce9667a379c393dad, thank you!

Ludo’.

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