From: Theodore Ts'o <tytso@mit.edu>
To: Anders Lind <anderslindgaard@yahoo.com>
Cc: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: Tune2fs metadata_csum
Date: Mon, 17 Dec 2012 09:37:03 -0500 [thread overview]
Message-ID: <20121217143703.GB31563@thunk.org> (raw)
In-Reply-To: <1355717041.99349.YahooMailNeo@web164606.mail.gq1.yahoo.com>
On Sun, Dec 16, 2012 at 08:04:01PM -0800, Anders Lind wrote:
>
> I tired to use tune2fs metadata_csum feature on my ext4 filesystem.
> I got message like:
> ~$ sudo tune2fs -O metadata_csum /dev/sda5
> tune2fs 1.42 (29-Nov-2011)
> Setting filesystem feature 'metadata_csum' not supported.
>
> Is this tool supposed been used on unmounted device or it could be mounted?
TYhe metadata_csum feature is in the e2fsprogs "master" branch in the
e2fsprogs git tree. The feature is not part of an official e2fsprogs
release yet. One of the things that I want to really check very
carefully before I release e2fsprogs 1.43 is that e2fsck sanely
recovers from checksum failures while it tries replaying the journal.
Essentially, metadata_csum is supposed to provide better recovery from
device failures (it doesn't really provide any kind of performance
advantage), and I want to be 100% sure that it is **always** better
when hardware-induced corruption happens before we release it.
Regards,
- Ted
next prev parent reply other threads:[~2012-12-17 14:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-17 4:04 Tune2fs metadata_csum Anders Lind
2012-12-17 7:23 ` Zheng Liu
2012-12-17 14:37 ` Theodore Ts'o [this message]
2012-12-18 3:19 ` Darrick J. Wong
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