From: Giovanni Biscuolo <g@xelera.eu>
To: A L <mail@lechevalier.se>, Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: how to recover from "enospc errors during balance"
Date: Fri, 02 Oct 2020 11:32:27 +0200 [thread overview]
Message-ID: <87v9ftdlck.fsf@roquette.i-did-not-set--mail-host-address--so-tickle-me> (raw)
In-Reply-To: <0afae20d-62d2-00eb-4ac5-fa9b5205a937@lechevalier.se>
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Hello,
A L <mail@lechevalier.se> writes:
> On 2020-10-01 10:56, Giovanni Biscuolo wrote:
[...]
>> --8<---------------cut here---------------start------------->8---
>>
>> ~$ mount -o skip_balance,relatime,ssd,subvol=/ /dev/sda3 /
>> mount: /: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error.
>>
>> --8<---------------cut here---------------end--------------->8---
>>
>> dmesg says:
>>
>> --8<---------------cut here---------------start------------->8---
>>
>> [7484575.970136] BTRFS info (device sda3): disk space caching is enabled
>> [7484576.001375] BTRFS error (device sda3): Remounting read-write after error is not allowed
>>
>> --8<---------------cut here---------------end--------------->8---
>>
>> Am I doing something wrong?
[...]
> I think you need to mount an unmounted filesystem and not re-mounting it
> (as per dmesg output).
>
> Example: "mount -o skip_balance /media && btrfs balance cancel /media"
Ah OK, now I understand
> However, I think this is your root filesystem, correct? They you must
> boot with a bootable media and do recovery from there
Yes it's the roof filesystem of that machine, so yes: I'll have to
recover via bootable media.
> Just remember that deleting data on Btrfs can increase metadata usage,
> especially if you have lots of snapshots and such. In the case your
> filesystem goes back into ro mode when deleting files, you may need to
> add two additional disks (or loop devices, usb sticks etc) to continue.
OK I'll do that.
Thank you both for your support!
Best regards, Giovanni.
--
Giovanni Biscuolo
Xelera IT Infrastructures
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next prev parent reply other threads:[~2020-10-02 9:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 14:25 how to recover from "enospc errors during balance" Giovanni Biscuolo
2020-09-29 15:07 ` A L
2020-10-01 8:24 ` Giovanni Biscuolo
2020-09-30 0:04 ` Zygo Blaxell
2020-10-01 8:56 ` Giovanni Biscuolo
2020-10-01 15:28 ` A L
2020-10-02 9:32 ` Giovanni Biscuolo [this message]
2020-10-02 2:44 ` Zygo Blaxell
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