From: Sebastian Ochmann <ochmann@informatik.uni-bonn.de>
To: wangsl.fnst@cn.fujitsu.com
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Meaning of \"no_csum\" field when scrubbing with -R option
Date: Thu, 20 Feb 2014 12:25:47 +0100 [thread overview]
Message-ID: <5305E63B.4000405@informatik.uni-bonn.de> (raw)
In-Reply-To: <5305DE1E.8080302@cn.fujitsu.com>
Hello,
> Sebastian Ochmann posted on Wed, 19 Feb 2014 13:58:17 +0100 as excerpted:
>
>
> So my question is, why does scrub show a high (i.e. non-zero) value for
> no_csum? I never enabled nodatasum or a similar option.
>
> Did you enable nodatacow option? if nodatacow option is enabled,
> data checksums will be also disabled at the same time.
No, never, not even on single files. Some additional info: The
filesystem is only a few weeks old (even though I see similar results on
an older filesystem as well), it's my root filesystem, and as mount
options I use "rw,noatime,ssd,discard,space_cache" (it's on a SSD).
Kernel version is 3.12.9.
Best regards,
Sebastian
next prev parent reply other threads:[~2014-02-20 11:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-19 12:58 Meaning of "no_csum" field when scrubbing with -R option Sebastian Ochmann
2014-02-20 10:31 ` Duncan
2014-02-20 10:51 ` Wang Shilong
2014-02-20 11:16 ` Duncan
2014-02-20 11:25 ` Sebastian Ochmann [this message]
2014-02-20 12:38 ` Meaning of \"no_csum\" " Wang Shilong
2014-02-21 2:30 ` Wang Shilong
2014-02-21 8:00 ` Duncan
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