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Date: Sat, 2 Mar 2013 17:12:37 +0600
From: Roman Mamedov <rm@romanrm.ru>
To: Gabriel de Perthuis <g2p.code@gmail.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Permanent uncancellable balance
Message-ID: <20130302171237.00afdc78@natsu>
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On Sat, 2 Mar 2013 10:07:45 +0000 (UTC)
Gabriel de Perthuis <g2p.code@gmail.com> wrote:

> Hello,
> I have a filesystem that has become unusable because of a balance I can't=
=20
> stop. It is very close to full, and the balance is preventing me from=20
> growing it.
>=20
> It was started like this:
> sudo btrfs filesystem balance start -v -musage=3D60 -dusage=3D60 /srv/bac=
kups
>=20
> It has been stuck at 0% across reboots and kernel upgrades (currently on=
=20
> 3.8.1), and cancelling it had no effect:
>=20
> Balance on '/srv/backups' is running
> 0 out of about 5 chunks balanced (95 considered), 100% left
>=20
> According to atop it is writing but not reading anything.
> Unmounting never terminates, so does remounting ro, the only way to=20
> temporarilly kill it is to reboot. SIGKILL has no effect either. Is there=
=20
> *any* way I can get rid of it?
>=20
> --
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Mount with the "skip_balance" option
https://btrfs.wiki.kernel.org/index.php/Mount_options
then you can issue "btrfs fi balance cancel" and it will succeed.

--=20
With respect,
Roman

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