From: Chris Mason <chris.mason@oracle.com>
To: jck <jck@archlinux.us>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Disk space usage displayed incorrectly?
Date: Mon, 12 Jul 2010 21:16:50 -0400 [thread overview]
Message-ID: <20100713011650.GN563@think> (raw)
In-Reply-To: <AANLkTil1adG5cmYxbjvzv7OygH9q12SyA2HL8bOWtuxp@mail.gmail.com>
On Sat, Jul 10, 2010 at 07:22:26AM +0530, jck wrote:
> Hello,
> when i check diskspace usage of a btrfs partition using df i get the
> wrong free space, this is expected i think.
We do try to take the raid levels into account during df, but only for
the space that is already allocated.
> However even when i use 'btrfs filesystem df' I get wrong freespace:
> Data: total=123.58GB, used=87.31GB
> Metadata: total=61.00GB, used=396.29MB
> System: total=32.00MB, used=16.00KB
>
> Does this mean that after the 123 GB of 'Data' fills up I wont be able
> to add more stuff to the partition?
> I'm using btrfs-progs-git (jul 10)
This does reflect the space that is allocated, but the drive itself may
have more free space. btrfs filesystem show will give you a few more
details.
Basically btrfs allocates from the drive in chunks of about 1GB and then
puts the file data or metadata into those chunks. So if you do a mkfs
and then create one file, you might have 1TB of space on the drive that
hasn't been allocated yet.
-chris
next prev parent reply other threads:[~2010-07-13 1:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-10 1:52 Disk space usage displayed incorrectly? jck
2010-07-13 1:16 ` Chris Mason [this message]
2010-07-13 1:53 ` jck
2010-07-13 4:02 ` jck
2010-07-13 5:17 ` jck
[not found] <AANLkTinA2QCqlrGoRvUn_uAZ1NxPm65DksQQ9YBeHrqh@mail.gmail.com>
2010-07-10 1:42 ` jck
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