From: Phillip Susi <psusi@ubuntu.com>
To: Daniele Testa <daniele.testa@gmail.com>, linux-btrfs@vger.kernel.org
Subject: Re: btrfs is using 25% more disk than it should
Date: Fri, 19 Dec 2014 13:53:38 -0500 [thread overview]
Message-ID: <54947432.5010107@ubuntu.com> (raw)
In-Reply-To: <CAN6BF2Luf3ERd+ShLyUavzM3bLmy9dT918Zg17xL9T42DNVtVQ@mail.gmail.com>
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On 12/18/2014 9:59 AM, Daniele Testa wrote:
> As seen above, I have a 410GB SSD mounted at "/opt/drives/ssd". On
> that partition, I have one single starse file, taking 302GB of
> space (max 315GB). The snapshots directory is completely empty.
So you don't have any snapshots or other subvolumes?
> However, for some weird reason, btrfs seems to think it takes
> 404GB. The big file is a disk that I use in a virtual server and
> when I write stuff inside that virtual server, the disk-usage of
> the btrfs partition on the host keeps increasing even if the
> sparse-file is constant at 302GB. I even have 100GB of "free"
> disk-space inside that virtual disk-file. Writing 1GB inside the
> virtual disk-file seems to increase the usage about 4-5GB on the
> "outside".
Did you flag the file as nodatacow?
> Does anyone have a clue on what is going on? How can the
> difference and behaviour be like this when I just have one single
> file? Is it also normal to have 672MB of metadata for a single
> file?
You probably have the data checksums enabled and that isn't
unreasonable for checksums on 302g of data.
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next prev parent reply other threads:[~2014-12-19 18:53 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-18 14:59 btrfs is using 25% more disk than it should Daniele Testa
2014-12-19 18:53 ` Phillip Susi [this message]
2014-12-19 19:59 ` Daniele Testa
2014-12-19 20:35 ` Phillip Susi
2014-12-19 21:15 ` Josef Bacik
2014-12-19 21:53 ` Phillip Susi
2014-12-19 22:06 ` Josef Bacik
2014-12-20 1:33 ` Duncan
2014-12-19 21:10 ` Josef Bacik
2014-12-19 21:17 ` Josef Bacik
2014-12-20 1:38 ` Duncan
2014-12-20 5:52 ` Zygo Blaxell
2014-12-20 6:18 ` Daniele Testa
2014-12-20 6:59 ` Duncan
2014-12-20 11:02 ` Josef Bacik
2014-12-20 11:28 ` Josef Bacik
2014-12-23 21:51 ` Zygo Blaxell
2014-12-20 9:15 ` Daniele Testa
2014-12-20 11:23 ` Robert White
2014-12-20 11:39 ` Josef Bacik
2014-12-21 1:40 ` Robert White
2014-12-21 3:04 ` Robert White
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