From: Tomasz Chmielewski <mangoo@wpkg.org>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Any chance to recovery btrfs raid-0 after accidental format of one volume?
Date: Tue, 06 Sep 2011 08:24:32 +0200 [thread overview]
Message-ID: <4E65BCA0.40109@wpkg.org> (raw)
> Bad case of user error here but I managed to reformat one half of a
> btrfs volume that was set up with metadata raid-1 and data raid-0.
It won't help you - but did you format it with mkfs.btrfs, while it was mounted?
mkfs.btrfs behaves very dangerously here.
For example, we have a block device in use:
# cat /proc/swaps
Filename Type Size Used Priority
/dev/md0 partition 10233276 0 -1
mkfs for other filesystems will refuse to touch it, because it's in use:
# mkfs.ext4 /dev/md0
mke2fs 1.41.14 (22-Dec-2010)
/dev/md0 is mounted; will not make a filesystem here!
# mkfs.xfs /dev/md0
mkfs.xfs: cannot open /dev/md0: Device or resource busy
mkfs.btrfs doesn't see a problem in creating a filesystem on a mounted block device:
# mkfs.btrfs /dev/md0
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
fs created label (null) on /dev/md0
nodesize 4096 leafsize 4096 sectorsize 4096 size 9.76GB
Btrfs Btrfs v0.19
--
Tomasz Chmielewski
http://wpkg.org
next reply other threads:[~2011-09-06 6:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-06 6:24 Tomasz Chmielewski [this message]
[not found] <CAKdoYmDNjBDgHjLNaf5HmrRxGkYPXjssZoGa3Tb4p3uc2DcOcg@mail.gmail.com>
2011-09-05 21:56 ` Any chance to recovery btrfs raid-0 after accidental format of one volume? Dante
2011-09-06 23:00 ` Dante
2011-09-06 23:12 ` Hugo Mills
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