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Date: Sun, 02 Nov 2014 19:49:05 -0800
From: Robert White <rwhite@pobox.com>
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To: Tobias Holst <tobby@tobby.eu>
CC: Rich Freeman <r-btrfs@thefreemanclan.net>,
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Subject: Re: filesystem corruption
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On 11/02/2014 06:55 PM, Tobias Holst wrote:
> But I can't do a balance anymore?
>
> root@t-mon:~# btrfs balance start /dev/sda1
> ERROR: can't access '/dev/sda1'

Balance takes place on a mounted filesystem not a native block device.

So...

mount -t btrfs /dev/sda1 /some/path/somewhere
btrfs balance start /some/path/somewhere