From: Roman Mamedov <rm@romanrm.net>
To: Marc MERLIN <marc@merlins.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: How to find/reclaim missing space in volume
Date: Mon, 5 Jun 2023 21:47:04 +0500 [thread overview]
Message-ID: <20230605214704.35cf752e@nvm> (raw)
In-Reply-To: <20230605162636.GE105809@merlins.org>
On Mon, 5 Jun 2023 09:26:36 -0700
Marc MERLIN <marc@merlins.org> wrote:
> I'm confused, the volumes above are snapshots with mostly the same data
> (made within the last 2 hours) and I didn't delete any data in the FS
> (they are mostly identical and used for btfrs send/receive)
>
> Why do they add up ot 600GB, but btrfs says 847FB is used?
- deleted snapshots that are still in the process of deletion
- deleted files that are still open by running apps
- files in subvolumes other than the currently mounted one (assuming mounting
a non-root subvolume)
- a huge amount of no longer used metadata chunks (does not apply here,
considering the fi df output)
- the infamous extent booking peculiarity of Btrfs, assuming you have large
files that are partially rewritten in-place (such as VM images or databases)
--
With respect,
Roman
next prev parent reply other threads:[~2023-06-05 16:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-05 16:26 How to find/reclaim missing space in volume Marc MERLIN
2023-06-05 16:47 ` Roman Mamedov [this message]
2023-06-05 17:00 ` Andrei Borzenkov
2023-06-06 1:46 ` Marc MERLIN
2023-06-06 4:47 ` Andrei Borzenkov
2023-06-06 16:41 ` Marc MERLIN
2023-06-06 18:25 ` Roman Mamedov
2023-06-07 2:12 ` Qu Wenruo
2023-06-07 19:17 ` Marc MERLIN
2023-06-07 19:32 ` Hans van Kranenburg
2023-06-07 20:02 ` Marc MERLIN
2023-06-07 20:31 ` Hans van Kranenburg
2023-06-06 18:19 ` Graham Cobb
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