From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Subject: Re: cannot boot with BTRFS in degraded mode
Date: Sat, 07 Sep 2019 09:20:53 +0900
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In-Reply-To: <87tv9pzrhe.fsf@roquette.mug.biscuolo.net> (Giovanni Biscuolo's
 message of "Fri, 06 Sep 2019 11:47:09 +0200")
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To: Giovanni Biscuolo <g@xelera.eu>
Cc: help-guix <help-guix@gnu.org>

Hello Giovanni,

Giovanni Biscuolo <g@xelera.eu> writes:

> Hello Maxim,
>
> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
> [...]
>
>> Fixing the Grub config (manually or not) is one thing, but not enough,
>> as it is the init script (contained within the initrd)
>
> Yes I was obviously wrong: the initrd must be updated, also!
>
>> run by the kernel
>> that mounts the root partition.  This script currently doesn't honor the
>> rootflags= argument given to the Linux kernel command line, which means
>> that you cannot pass extra options (such as 'degraded') to mount your
>> root partition during the early boot process of the system.
>
> Yes, now I understand, thanks!
>
>>> Anyway, with the help of a friend, in a few hours we are going to test
>>> this solution :-)
>>
>> Good luck!
>
> The only viable solution to this problem is to boot a rescue system and
> fix the BTRFS array there: I'm doing it now via grml (remotely via ssh
> with the help of a friend who "manually" started the network and ssh
> daemon)
>
> For the records, this is what I did:
>
> 1. btrfs replace start 5 /dev/sde /target (since the missimg one was the
> 5th)
>
> 2. btrfs replace status /target
>
> it took less then 10 mins to replace a 1TB disk with 76.28GiB used:
>
> Started on  6.Sep 09:21:44, finished on  6.Sep 09:40:45, 0 write errs, 0 uncorr. read errs

Great! It looks like you're all set! Thank you for maintaining a build
machine :-).

Maxim